Soory for the late response - I'v e been away from the BB working in NZ for the past week. Several points need to be considered when mounting cameras in cars. As rain has already noted in any impact a camera can become a projectile - not desireable at all. What nobody has mentioned is that vibration kills video cameras - I have lost 12 Sony DV cameras so far from shooting motorsport, and these were securely mounted inside specially made steel boxes, wrapped in hi density foam and bolted to the structure of the vehicles with rubber vibration mounts. To be fair they were mounted in Super Trucks, Commodore Cup cars, Nascars and HQs, and came in for a fair pounding, but nevertheless all of them died!
We used inexpensive security cameras to feed the pics to the recorders, and regarded these as sacrificial - if we could record a crash in progress the footage was always sensational! Also, security cameras have really wide angle lenses available at minimal cost. For mics we made up little Jaycar kits and hid them in the mounted boxes to avoid wind noise and to attenuate the levels to a usable signal.
The lipstick cameras were simply gaffertaped in place inside or outside the vehicle - they only weigh a few grams and scrutineers were happy. Finally - beware the suction mount. The good ones have a vacuum mechanism to really get a grip, and they will certainly do that, but you won't like the bubble in your bonnet when you pull them off, as they can readily bend panels...
So - would I put a camera in my car? yes, but only with a really cheap recorder, not an expensive Sony