My satellite weighing about 500 g each. Even with proper application of force can not be adjusted this (only with dissolved screw). It can therefore be assumed that even heavier satellites will have a good grip. However, the maximum load I can not judge.
However, the vertical pivoting of 40 ° I see as a "very optimistic". For most applications, however, the actual incline capacity should be sufficient.
For satellite assembly I have taken the screws that were with my speakers here to mount the feet.
Visually, the wall mount fit also very good to my satellite.
From me a very strong buy recommendation!