I made this for the Plus Six with 3D printing (white is prototype) it fix in the glovebox and I put a magnetic phone support on your it.
No hole in the dashboard, only 3 x 3mm quite invisible holes in the glovebox and the mount back plane is practically invisible.
If someone want the 3D file just ping me. (You can adjust the ball size but you have to print it with min 60% filling rate)
[Linked Image]
[Linked Image]
Dada