Mercedes C-Class w204 iPhone 6 mount for Audio 50 APS

The build-in navigation system of my Mercedes W204 (Bj. 2011) is an useful but not very beautiful tool. I searched for an mounting system to get my iPhone 6 working as an replacement navigation system but did not find an working solution for my needing.

My design fits following specifications:

-mount- and removable within a few seconds
-stable stand while slow down, accelerate and driving curves
-minimal flattering while driving
-minimal design to ceep the cockpit clean
-possibility t