Tile Backsplash Inside Corner . Inside corner trim is used for backsplash and wall installations. Start your tiles from the middle of the wall at the bottom. Subway Tile Backsplash Inside Corners from www.houzz.com How to install tile in a corner backsplash use your tape measure, level and pencil to mark out the area for. In this kitchen remodel below, we used no side backsplash in both the kitchen and the butler’s pantry areas. Remove all of the outlet and switch cover plates with a screwdriver.