The underside of the Trunk handle, right side light cover removed. THis is where I see everyone else mounting it, but mine doesn't really mount well and I dont have any mounting hardware.
-1983 Grey 528e (Given to Charity)
-1995 Champagne Toyota 4Runner (Friend Totaled) -2000 Black 323i (From DD to Project Car)
-2011 Black Toyota Prius III (DD)