Clever Mosaics product peel and stick Tiles can be installed without any problem on any smooth undamaged surface. So, a non-textured wall or backsplash is perfect for Clever Mosaics because the tiles will have an excellent grip.

Here is a partial list of ideal surfaces for Clever Mosaics:
painted gypsum (the paint must have been applied at least 21 days before),
smooth ceramic tiles backsplash, smooth glass tiles backsplash, wall panel (acrylic), wall linoleum, mirror, wallpaper (if some corners are peeling, just peel them off and install Clever Mosaics over them), in the bathroom without a large amount of water soaking
it is not recommended to install Clever Mosaics:
on the countertop,
on the floor,
on the ceiling.