This mounted support stand is designet to clip into the vent slots. you can also turn the mount 180deg to keep the warning light button visible.

The tablet stands on this mount to prevent it from falling down. A rubber band is used to prevent the tablet from falling over while driving.

only works on audi a4 b9.

I also added a tablet-mmi support thing you can glue on the cover of your tablet as an alternative to the rubber band. I used an ipad air with a magentic cover.