For placement on tile, tile squares must be at least 4" x 4" in diameter.Position at any height for shaving in the shower. Can be easily moved or relocatedAngled for better balanceMounts directly on shower wallEasy installation.. If device is required to bear full body weight, or is used for leverage, it is recommended that a traditional permanently foot rest be installed.Must be applied to smooth, dry, non-porous surfaces, such as, glazed ceramic tiles, plastic or glass. Item does not suction to textured or bumpy surfaces; this surface MUST be smooth and flatDo not place over grout lines as this allows air to move under the suction cup thereby releasing its holdAlways test to confirm that suction is tight before each useCAUTION: To be used only as a balancing assist NOT for body weight leverage