We advise checking with your insurers and your warranty provider as some companies take different stances on whether dash cams are a modification to a vehicle - especially if they're hardwired. A dual dash camera setup is a great idea, unfortunately, dash cams can attract unwanted attention. It depends on a lot of factors though - i.e., where you live, whether you park on-street or on a driveway etc. Each of our cars at the HJ office has a dash cam fitted and none have ever been broken into, but that's just personal experience. You could opt for something small, like the Garmin Mini, but this isn't compatible with a dual dash cam setup. Or you could opt for a camera that has a quick detachment, i.e. the new Nextbase cameras are charged via the magnetic mount so the dash cam can be removed quickly and put in a glove box while the mount stays attached to the windshield. Then there's no fuss reattaching the mount or wires when you're back in the vehicle.

Garmin Mini review: kit.honestjohn.co.uk/reviews/review-garmin-mini/

Nextbase 422 (and rear cam) review: kit.honestjohn.co.uk/reviews/review-nextbase-422gw/