Assets/_Project/Scripts/Gameplay/TowerPlacementManager.cs

@@ -601,9 +601,9 @@ namespace TD.Gameplay
             }
 
             Vector3 spawnPos = GridCoordinates.GetFootprintCenterWorld(anchor, def.FootprintSize);
-            // Towers sit on the buildable plane (Y=0); raise slightly so the mesh base
+            // Place on the buildable plane (Y=0); SeatOnGround below corrects the final Y
-            // sits flush rather than half-clipped. A cube of scale 1 needs +0.5 on Y.
+            // from the mesh bounds so the tower rests flush regardless of its pivot.
-            spawnPos.y = 0.5f;
+            spawnPos.y = 0f;
 
             var go = Instantiate(def.TowerPrefab, spawnPos, Quaternion.identity);
             var instance = go.GetComponent<TowerInstance>();
@@ -626,9 +626,32 @@ namespace TD.Gameplay
                 Destroy(go);
                 return;
             }
+
+            // Seat the tower flush on the ground from its mesh bounds — BEFORE Spawn so the
+            // corrected transform is captured in the spawn sync. Handles any pivot.
+            SeatOnGround(go, groundY: 0f);
+
             netObj.Spawn(destroyWithScene: true);
         }
 
+        /// <summary>
+        /// Shifts <paramref name="go"/> vertically so the lowest point of its combined
+        /// renderer bounds rests at <paramref name="groundY"/>. Lets towers be authored with
+        /// any mesh pivot (center, base, etc.) and still sit flush on the ground — no
+        /// per-prefab Y tweaking. No-op if the prefab has no renderers.
+        /// </summary>
+        private static void SeatOnGround(GameObject go, float groundY)
+        {
+            var renderers = go.GetComponentsInChildren<Renderer>();
+            if (renderers.Length == 0) return;
+
+            Bounds b = renderers[0].bounds;
+            for (int i = 1; i < renderers.Length; i++)
+                b.Encapsulate(renderers[i].bounds);
+
+            go.transform.position += Vector3.up * (groundY - b.min.y);
+        }
+
         // ----- Utility ----------------------------------------------------
 
         private static bool TryGetDefinition(int typeId, out TowerDefinition def)