Its not an adhesive, its a semi-soft gripper that works well for me and its easily moved from vehicle to vehicle. You just pick it up and move it. Its very hard to slide but does not stick at all.
It has a tacky pad under it, you can bend the base to fit the angles of your dash. The suction mount I originally had kept popping off over time and with heat.
I am not sure. When I went looking at the friction mount I had the docking mount with me. I just open the box (it wasn't sealed) and to see if it would fit. I would think that all Garmin products have standard size for mounting.