Here's my 2¢ and my mount. I use the windshield suction mount that came with my unit, and placed it on the small triangle window. That puts it to the left within easy reach and out of my view of the road (hate those drivers that put it on the windshield near the rear view mirror where it can block one's view).
Some may complain that they can't use it with their left hand- not an issue for me. Others might say that their co-pilot can't reach it there. (I currently have no co-pilot/navigator, but that's a different problem!

) I can always unplug the leads, remove from mount and hand it to my navigator (when I'm safely stopped!

).
You might also notice that the window is tinted. So far, after 6 months no problem. I waited a couple days after I tinted before I remounted the GPS. You might also notice that I ran the power and antenna cables under the dash and trim, with a small trimmed grommet to avoid chaffing. The antenna is centered behind the rear view mirror out of my field of view.