I also use a suction cup mount for my Garmin. On the walnut veneer dash of my 4/4 it fits just to the right of the glove-box lid. (Photo of dash below)
Travelled all over France - no problems or marks on the dash.
I also have the power lead (from the cigar lighter in the glove box) threaded through and tucked away under the dash.


Attached Images
Interior.png (1.35 MB, 79 downloads)
Bud
4/4 "Stanley"