The official mount is decent, but the suction cups included with mine (in 2017) were junk. I bought a RAM mount suction cup - https://smile.amazon.com/dp/B008JGZMZK/ - removed the ball via the screws, and drilled + countersunk holes through the Stratux holder to attach it to the RAM mount.
I've used a suction mount here: https://www.amazon.com/gp/product/B008JGZMZK/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1
Go big or go home with this aspect of it, just like the quality of lube, cleaning materials, certain accessories, etc. In the grand scheme, all that stuff is very inexpensive if you're really trying to get the appropriate effect and not mess around. Mount: this to this to this. And be clean with this, also so that you can just liberate yourself and not worry about that aspect.
I know gopro is the brand everyone's got a raging hardon for, but I bought one and loathed it, couldn't get rid of it fast enough.
I ended up buying a few other cameras since then for various things, the one I use as often as possible is a Kodak SP1
Specific to in-car filming, it's nice that the field of view is wide enough I can mount this on the windshield and get both driver and front seat passenger in the shot comfortably.
The Drift Ghost is a pretty good camera too, but if I was buying another action cam today it would be another Kodak SP1.
Also pick up this and this and this if you're going to do any inside or outside car filming. Sticks on (very clean) paint and glass very well. It's always scary to put a pricey piece of gear outside a car, and I always use some gaff tape on a retainer for double protection but this mount has never let me down and it holds the camera very steady, no shaking.