Hi! Good question. Its tricky. You try and plan the tile layout so it hits the outlet as best as possible to lay flat. However, there really is no ideal layout that makes that happen perfectly. You need to accept that there will be some gapping between the outlet trim and the tile. I like this solution better than creating a frame of sorts (out of another flat tile) around the outlet for the trim to land on. If the tile were more heavily dimensional that would probably need to happen. The way we did it as described above doesn't look perfect, but doesn't look bad either. Good luck!