Another vote for the Kenu Airframe+.
It works great on my 2006 Mini Cooper. I put it in the vent just to the right of the steering wheel. It holds the phone up high where I see incoming notifications without distraction while I drive.
It's so easy to remove that I think it will fall out of the vent. However, it has never fallen in the few days I have used this larger model and never fell out during the 6 months I used the smaller model for my iPhone 5s. And my little car drives rough over bumps and around curves.
I love it and the think it has made me a safer driver because I'm not tempted to fumble with my phone while driving. For $30 it seems pretty pricey for what it is, but I haven't found a better, unobtrusive mount for my little car.