Yes. It sticks everywhere. I have it on a wooden door.

On the suitability for the bathroom: In my eyes, the holder is definitely suitable for the bathroom. I have mine hanging in it as well and despite the tiles getting tarnished every day, it is still firm. About the load-bearing capacity: It depends primarily on the material on which the holder is mounted. I have it on lacquered wood and it easily holds 4 bathrobes. Hope it helps.