Tower Defense Template in Blueprints - UE Marketplace (unrealengine.com) (Have not tried but looks good)
Tower Defense Starter Kit in Blueprints - UE Marketplace (unrealengine.com) (Have tried and it does exactly what you would expect it to. )
If you are looking at going the unreal route. Also feel free to join our discord if you have any questions or need help getting started with unreal. We are a very friendly community that helps each other strive.