My Volvo has a slot in the dash below the radio just big enough for business cards, or a pack of playing cards. I plan to cut a piece of wood that size, attach a piece to the end of it, big enough to attach the 4 screws.
Spray paint it black and voila...

Now all I need is wood, a saw, paint and time ;-)


... they should have shipped it with a suction cup in the first place.