The wall mount makes a very good impression ... - but only at first glance. Since I own a 929 Thule, I had seen after stopping, the distance between the ball head and base for our support is too short. I have solved the problem that I have put a spacer plate of 40mm thickness of the mounting plate. I had to replace the screws. This reduces the max. Capacity of the wall bracket. For 20kg of the bicycle rack it should still not be enough.
The manufacturer may indicate that this wall mount is only suitable for EUFAB bike rack.