I use an AC vent mount I got off EBay
http://www.ebay.com/itm/GN047-SBH-AC-Vent-Mount-for-COBB-Tuning-AccessPORT-V3-or-Garmin-Nuvi-DEZL-GPS-/331734543204?hash=item4d3ceb6b64:g:m-UAAOSwSHZWcaUS
Ran the cord through the console and it sits in my passenger side air vent.
Didn't want rings on my...