I use the magnet mounts as well but a vibrating PH on a fixed magnet with nothing to absorb the vibration makes a lot of noise. I have some modded Maxijets that vibrate a bit much on occasion.
For small PH's, I like the mini maxis. The suction cups will fail though.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,