We have the pads mounted exactly according to instructions, and after three months of the first detector has fallen from the ceiling. Fortunately no one was near, and the wooden floor was not damaged. It has the pad, which was on the detector itself solved, although we have bought extra a Suggested for Magnetolink device (absolutely flat on the adhesive side).
Once again a product of GEV what is not to be used (also with the video intercom from GEV extreme problems, so like many others / see rec.).