I'm installing two recessed medicine cabinets on opposing walls in an alcove with the front wall having a wall to wall fixed mirror. Currently the bathroom sink & counter top are in an alcove area. On the back wall there's a wall to wall mirror 75 inches long. On the right the side wall comes out 32 inches. The other wall on the left comes out 36 inches.

My question is, how do I center or locate the medicine cabinets with the walls on opposite walls being different lengths? Do I make both cabinets the same distance from the front wall with the mirror, or locate the cabinets in the center of the wall that they are to be installed in?