Do you have a pic of the flip side? I'm wondering how you secured it. I'm thinking you used a simple drilled plate. Also, that looks like a RAM handlebar mount, yes? Did it need to be altered in any way or just bolted on?
Only have this pic from my initial testing and fitting but it will give you and idea about how it's (secure) bolted
Once I had the correct fitment I drilled an additional hole in the middle of the RAM Handlebar Mount (which comes with every Garmin GPS) for the 2nd bolt. And of course drilled the 2 holes in the screen mount.
And would have done this sooner but would have thought some kind of GPS mount was developed for it by now...
Anyway...this was easy peasy to do...