I have a Garmin GPS unit with lifetime updates. I am having trouble mounting it in my Solstice. It's illegal to mount something to the windshield with a suction cup in California. I tried the suction cup dash mount in my Saturn but the unit would just fall off. I went to a friction mount which worked fine for the Saturn with its flat dashboard. It's not working so well with the Solstice. The Solstice dashboard is all curves and slopes. The thing won't stay put. I want it to be up where I can see it because I can't hear it very well with the top down. Any ideas?