gather-and-defend/Assets/Scripts/LevelEditor/SpawnerTile.cs

using UnityEngine;
using UnityEngine.Tilemaps;

[CreateAssetMenu(menuName = "Gather And Defend/Spawner Tile")]
public class SpawnerTile : TileBase
{
    [SerializeField]
    private Sprite _sprite;
    [SerializeField]
    private GameObject _prefab;

    public override void GetTileData(Vector3Int position, ITilemap tilemap, ref TileData tileData)
    {
        tileData.sprite = _sprite;
        tileData.transform.SetTRS(Vector3.zero, Quaternion.identity, Vector3.one);
        tileData.color = Color.white;
    }
    public override bool StartUp(Vector3Int position, ITilemap tilemap, GameObject go)
    {
        if (!Application.isPlaying) return base.StartUp(position, tilemap, go);
        Instantiate(_prefab, new Vector3(0.5f, 0.5f) + position, Quaternion.identity);
        return base.StartUp(position, tilemap, go);
    }
}