I'm actually using the original USB stick that came with the car. I don't feel the need to store hours of footage of people walking by my car in the parking lot
But I do know that the T7 comes with a rubberized outside shell which I would imagine provides some friction and probably won't slide too much. Also, the drive is very rugged, you can drop it from 10ft with absolutely no damage. Since it's a solid state drive (aka no moving parts), vibrations and shifting around won't affect anything either. The only concern (a minor one at that) would be if it tugs on the cable... but simple solution here is just to get a slightly longer cable so the drive can travel the whole length of the glove box without straining the cable.
I'd also imagine you already have other stuff in your glove box like manual or insurance docs or whatever else. That would keep the drive's travel to a minimum.
If you're feeling paranoid, you could get one of those gripper pads for opening jars and stick it underneath or cut out a square of cabinet liner. If you go the more "permanent" route you can use stick-on velcro strips.