Hmmm... not sure of the way the 5th gen's dash is made, but I, for one, prefer to put my GPS on the left side of the cluster.
No huge blind spot in the middle of the windshield, and wires are easier to conceal.
In my Subaru, I hardwired mine using a piggyback fuse holder on top of another accessory fuse, and ran the wire between the corner of the dashboard and the A-pillar trim (removing the trim often gives you some space to wiggle the wire through).
So when I remove it, the only thing in sight is a tiny piece of wire than I can pretty much push down flush with the base of the windshield.