I have tried a few mounts over the years, and quite a few have failed. Due to my own circumstances, I ended up with a system that worked for me. Namely, a Pat Walsh Dash Shelf, and this allowed me to mount a few units on the same shelf.
But, I also utilised the RAM mounts that were designed for certain equipment. My Montana GPS RAM mount has been the ducks nuts for many years.
The failures in equipment I have suffered, have been more to do with ball mounts on the handlebars
Cheers
TS