Re: How in heck do you stick anything to the dash?!
DO NOT leave a GPS holder visible in your car when you leave it unattended. Thieves may think that the GPS unit itself is hidden in the glove box or console. Whose car are they going to break into the one with no holder visible or the one with the visible holder?
They may think that it is worth the risk to smash the glass or rip your top open to find out. It has happened around here, people like these toys and they sell easily.
For that matter never leave anything visible in your car, take it with you or hide it in the trunk, under the trunk carpet works in the coupe for smaller items, looking through the hatch who's to say the mat is a foot above the trunk floor?