I can’t seem to upload an image of my current mount, but it mounts flat on the top of my dashboard on a little plastic sheet that’s permanently affixed to the dashboard.
The mount has a suction cup made of that sticky rubbery stuff. Any new mount needs to mount the same way. I’m hoping some of you have similar mounts and have some experience with what holds such a large phone well. (I have a slim case).
Honestly, I love the pro-clip USA mounts.
They are a bit pricey, but they clip to the dash rather than stick to it and can be removed easily while being very sturdy.