There are "two sides of a coin". I also like stealth install, like dedicated high quality mirror dvr with 24/7 auto-parking motion detection rec, very good night vision etc, rear camera built into rear centre brake light, but there are no such solutions yet.
Having stealth dash cam does not putt off thief of braking into your car, its opposite, - he doesnt see dash cam and more confidently commits crime stealing something from your car.
Having sticker "24h live CCTV recording + wireless data transmitting" and dedicated dash cams ( example built into mirror ) in most situations puts off thief to brake into the car. If dash cam is built into mirror or any other dedicated solution which takes a long time to remove, will not be interesting for thieves. But still, thief should be warned by sticker about your car dedicated dash cam solution with "wifi live data transmiting".