I have big tiles 13x16 that have a smaller 2x4 tile in the center. The problem is that the center tile is not flat. So on my wall the switches end up with only part of one side on the thicker center tile so when you put the face plate on there is a big gap around most of the tile. I cant move the switches in this wall what are some of the solutions ? I tried rearranging the tiles but it won't line up for all the face plates.