An ingenious thing: The support plate is attached with an adhesive according to illustrated instructions, which can be said to remove at the desired location. Then you wait 24 hours before you push the roll holder on this carrier plate and fixed with a small Allen screw on the bottom. Done. Keeps now for months bombproof and without wobbling.
I have therefore also a towel rail mounted, a towel ring and toilet brush holder, also perfect. Maybe a bit more expensive than other similar devices, but through this hole-free advantage actually cheaper if you even want to change something. The metal surfaces are worked beautifully, without burrs and good attack. Recommended.