Rotating a tilemap with ruletiles

Hello there. I've used the 2d extras package to build custom rule tiles for the walls and floor. As shown on the left hand side of the image. Now I want to make a bunch of rooms and turn them into prefabs so I can use them at runtime as needed. I would like to be able to rotate these prefab rooms and refresh the tilemap, but I can't find a way to do so. I rotate the grid transform and refresh but to no avail. It seems like its more complicated than that. Like remapping the grid or something. Games like with sprites like Stronghold rotate camera. How do they do it and how could I bring that into Unity?? Would appreciate any advice here. Thank you