This Unreal Engine 5.4 video is about placing and rotating Tiles.
We start by converting the Build Helper Save Data Tiles Map, and the Build Helper Level Added Tiles Map, to both use struct values. We then add a Del(ete) Tile Function, and add a Select Actor to show where we’ll be placing Tiles. Next, we add the logic to rotate those Tiles, and finally, call Add Tile on Left Mouse Button and Del Tile on Right Mouse Button.
https://dev.epicgames.com/community/learning/tutorials/qBOO/unreal-engine-54-level-build-helper-3-let-s-make-a-tower-defense-game