kingrollo
Guru
You could also use a pair of pressed steel shelf brackets and screw them directly to the wall. An offcut of old carpet or foam duct taped around the bracket will protect the frame paint.
These things look primarily aimed at the rather strange breed of cyclist who hangs their bike up on their living room wall and wants a cosmetically acceptable fixing. An expensive way to keep your tyres clear of the carpet. Doesn't save space or confer any other advantage that I can see.
Your bike doesn't get knocked when A N Other family member goes into the garage looking for something- quite a big advantage if you have an expensive best bike.