I've now bought several of these:
http://www.amazon.com/gp/product/B01...ilpage_o00_s00
I really like the convienence of the magnet mount, instead of a grabber style. I also have a couple of the Kenu vent mounts but this Spigen one is super cheap and works better. It comes with several metal plates (round and rectangular) that go under the case and clear plastic film to stick in the phone first to protect it. I don't stick it to the phone, just stick under my case. Holds the phone perfect.
Though I'm not a big fan of the vent mount, and that won't work well for the Camaro. In my Chevy Express van (bike hauler) I removed the vent clip portion (it just unscrews from the back) and drilled a small hole (M4X12mm bolt) in the vans center dash and permanently mounted it. No big deal in the van but not something I want to do in the Camaro.
I think a proclip mount but with this Spigen magnet disk mounted to it will be ideal.