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Something very small and inconspicuous so that it won't get ripped off. I'd recommend against a GoPro if you want to do a permanent install. If you plan to take it off every time you get out of the car, then sure, why not? You can use it when you ski, play guitar or vomit in a toilet too. Check out Amazon, they have a bunch of different dash cam selections. Go with the one that has the best user feedback.