I used those clamping ones on my walls, with my Lunas at a modest angle, and almost lost them - they 'crept' out over time (the adhesive cushions did not stay in place on the mount). The pads stayed in place against the speakers, but the adhesive allowed the pads to move along the mount over time. SO, I later added a wire retainer using the back speaker mounting hole to ensure it couldn't go far enough to get out.