I installed a Thinkware F800 2-channel dash cam in my GLC in just a few hours. I also installed a Cellink B v2 battery pack which charges only when the vehicle is running. When the vehicle is off the Cellink will power the cameras in parking mode for 24+ hours. The Cellink is important as the GLC has start/stop technology and the Cellink keeps the cameras powered even if the start/stop would cause a camera restart (unlikely). Once the Cellink is no longer charging the F800 dash cam senses this and then goes into parking mode. The installation in the GLC wasn't overly difficult.
