[bumpy]

If you need something to record while driving, most on market will do the job, Viofo A119 or A129 have good rep for video quality and reliability, Vantrue N2 Pro or N4 are also decent.

If you care about recording during parking, like I do, Blackvue or Thinkware is the only way to go.

I run Blackvue DR750X-2CH on wife's Audi and DR750-2CH LTE on my X2. Video quality is mediocre but have stealth design, app that's easy to use with enough setting granularity, built in LTE for live view during parking and instant impact/motion notification made it a fairly easy decision for me. Just released DR900/750/590 X series have built-in voltage detection so they instantly switch between parking and driving mode now, as well as preventing battery drain, if you decide to hardwire it.

Rear cam install was easier than expected on both cars, just tuck the wires under trim. On X2 I'm using battery bank that's connected to cigarette outlet to power the cams during parking without hardwiring.