I have an Acadia and I placed mine just below the black mesh part directly behind the rearview mirror. I wouldn't be too comfortable stowing it in the glovebox. Prior to getting a second set of velcro pads, I had left it up on top of the dash at the windshield on my wife's car occassionally. That worked fine but I hated how it slid all over the place if I didn't feel like putting it away right away. Better safe than sorry as the tolls are pricey enough if you pay them the first time. A few missed tolls can sure add up in penalty fees.