I use the vent mount from Naztech myself. It does have two different sections that you can tighten to get the perfect angle you are looking for. It is also very tight clipping into the vent as well. I have been using it for at least 6 months and have only had to re-adjust/re-tighten it one time. (as with all things like this it does loosen up over time) However, once re-adjusted it was back in its original position and holding strong.
I have a few products from Naztech and I like them all. From this drop I have the Magbuddy Vent Mount wireless charger, the Magbuddy Desk wireless charger, the Headrest mount, and the Airplane mount. They all work great.