It can be used without problems on a flat floor. If there is a step, lifting the holder away from the floor, the pad and the holder may come off. Also the vertical surface. When the pad is misaligned while it is rubbing vigorously, the jagged part of the back side of the holder hits the floor and there is a possibility of hurting. If it seems that the degree of contamination does not change very much, it is better to use an integrated type. The strength of the holder itself, design, price setting etc are no problem.