it works \o/

src/main/java/me/youhavetrouble/notjustnameplates/NotJustNameplates.java

@@ -1,13 +1,13 @@
 package me.youhavetrouble.notjustnameplates;
 
-import me.youhavetrouble.notjustnameplates.listeners.TeamManagementListener;
+import me.youhavetrouble.notjustnameplates.nameplates.TeamManagementListener;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public final class NotJustNameplates extends JavaPlugin {
 
     @Override
     public void onEnable() {
-        getServer().getPluginManager().registerEvents(new TeamManagementListener(), this);
+        getServer().getPluginManager().registerEvents(new TeamManagementListener(this), this);
     }
 
 }

src/main/java/me/youhavetrouble/notjustnameplates/nameplates/Nameplate.java

@@ -3,12 +3,15 @@ package me.youhavetrouble.notjustnameplates.nameplates;
 import net.kyori.adventure.text.Component;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.entity.Display;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.TextDisplay;
 import org.bukkit.event.entity.CreatureSpawnEvent;
-import org.bukkit.event.player.PlayerTeleportEvent;
+import org.bukkit.util.Transformation;
 import org.jetbrains.annotations.NotNull;
+import org.joml.AxisAngle4f;
+import org.joml.Vector3f;
 
 import java.util.UUID;
 
@@ -16,7 +19,7 @@ public class Nameplate {
 
     private Component name;
     private final UUID playerUuid;
-    private double heightOffset = 0.5;
+    private float heightOffset = 0.75f;
 
     private TextDisplay textDisplay;
 
@@ -40,7 +43,18 @@ public class Nameplate {
                             textDisplay.setInvulnerable(true);
                             textDisplay.setPersistent(false);
                             textDisplay.text(this.name);
+                            textDisplay.setAlignment(TextDisplay.TextAlignment.CENTER);
+                            textDisplay.setBillboard(Display.Billboard.CENTER);
+                            textDisplay.setInvulnerable(true);
+                            textDisplay.setTransformation(
+                                    new Transformation(
+                                            new Vector3f(0, heightOffset, 0), // offset
+                                            new AxisAngle4f(0, 0, 0, 0), // left rotation
+                                            new Vector3f(1, 1, 1), // scale
+                                            new AxisAngle4f(0, 0, 0, 0) // right rotation
+                                    ));
                         });
+        player.addPassenger(textDisplay);
     }
 
     /**
@@ -63,7 +77,7 @@ public class Nameplate {
     /**
      * Set height offset from the player's eye location
      */
-    public void setHeightOffset(double heightOffset) {
+    public void setHeightOffset(float heightOffset) {
         this.heightOffset = heightOffset;
     }
 
@@ -76,10 +90,22 @@ public class Nameplate {
     /**
      * Update the nameplate position
      */
-    public void updatePosition() {
+    public void update() {
+        Player player = Bukkit.getPlayer(playerUuid);
+        if (player == null) return;
+        if (player.isDead()) {
+            remove();
+            return;
+        }
         createDisplayEntity();
-        Location location = calculateCurrentLocation();
-        this.textDisplay.teleportAsync(location, PlayerTeleportEvent.TeleportCause.PLUGIN);
+        if (!player.getPassengers().contains(textDisplay)) {
+            player.addPassenger(textDisplay);
+        }
+    }
+
+    protected void remove() {
+        if (textDisplay == null || textDisplay.isDead()) return;
+        textDisplay.remove();
     }
 
 }

src/main/java/me/youhavetrouble/notjustnameplates/nameplates/TeamManagementListener.java

@@ -1,8 +1,11 @@
-package me.youhavetrouble.notjustnameplates.listeners;
+package me.youhavetrouble.notjustnameplates.nameplates;
 
+import me.youhavetrouble.notjustnameplates.NotJustNameplates;
 import net.minecraft.network.protocol.game.ClientboundSetPlayerTeamPacket;
 import net.minecraft.world.scores.PlayerTeam;
 import net.minecraft.world.scores.Scoreboard;
+import net.minecraft.world.scores.Team;
+import org.bukkit.Bukkit;
 import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -10,25 +13,28 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashSet;
+import java.util.HashMap;
 
 public class TeamManagementListener implements Listener {
 
     private final Scoreboard scoreboard = new Scoreboard();
     private final PlayerTeam team = new PlayerTeam(scoreboard, "notjustnameplates");
-    private final HashSet<String> players = new HashSet<>();
+    private final HashMap<String, Nameplate> players = new HashMap<>();
 
-    public TeamManagementListener() {
+    public TeamManagementListener(NotJustNameplates plugin) {
         team.setNameTagVisibility(PlayerTeam.Visibility.NEVER);
+        team.setCollisionRule(PlayerTeam.CollisionRule.ALWAYS);
+        Bukkit.getScheduler().runTaskTimer(plugin, () -> players.values().forEach(Nameplate::update), 0, 1);
     }
 
     @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
     public void onPlayerJoin(PlayerJoinEvent event) {
         Player joiner = event.getPlayer();
+        players.put(joiner.getName(), new Nameplate(joiner.getUniqueId(), joiner.displayName()));
         for (Player player : event.getPlayer().getServer().getOnlinePlayers()) {
-            if (player.equals(joiner)) continue;
             addPlayerToTeam(joiner, player);
         }
         sendTeamMembers(joiner);
@@ -37,14 +43,23 @@ public class TeamManagementListener implements Listener {
     @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
     public void onPlayerQuit(PlayerQuitEvent event) {
         Player leaver = event.getPlayer();
+        Nameplate nameplate = players.get(leaver.getName());
+        nameplate.remove();
+        players.remove(leaver.getName());
         for (Player player : event.getPlayer().getServer().getOnlinePlayers()) {
             removePlayerFromTeam(leaver, player);
         }
     }
 
+    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
+    public void onPlayerTeleport(PlayerTeleportEvent event) {
+        Nameplate nameplate = players.get(event.getPlayer().getName());
+        if (nameplate == null) return;
+        nameplate.remove();
+    }
+
     private void addPlayerToTeam(@NotNull Player player, @NotNull Player target) {
         CraftPlayer craftPlayer = (CraftPlayer) target;
-        players.add(player.getName());
         ClientboundSetPlayerTeamPacket teamCreatePacket = ClientboundSetPlayerTeamPacket
                 .createAddOrModifyPacket(team, true);
         craftPlayer.getHandle().connection.send(teamCreatePacket);
@@ -57,13 +72,12 @@ public class TeamManagementListener implements Listener {
         ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket
                 .createPlayerPacket(team, player.getName(), ClientboundSetPlayerTeamPacket.Action.REMOVE);
         CraftPlayer craftPlayer = (CraftPlayer) target;
-        players.remove(player.getName());
         craftPlayer.getHandle().connection.send(packet);
     }
 
     private void sendTeamMembers(@NotNull Player target) {
         ClientboundSetPlayerTeamPacket packet = ClientboundSetPlayerTeamPacket
-                .createMultiplePlayerPacket(team, players, ClientboundSetPlayerTeamPacket.Action.ADD);
+                .createMultiplePlayerPacket(team, players.keySet(), ClientboundSetPlayerTeamPacket.Action.ADD);
         CraftPlayer craftPlayer = (CraftPlayer) target;
         craftPlayer.getHandle().connection.send(packet);
     }