This mount fits all GoPro and is easy to mount as this just happens with suction cup. It is ideal to have in the windshield of the car if you are going on a roadtrip, or if you would like to just film in the car.
It is this mount that most often gets used in the movies you can see on the web where people have caught something funny or dangerous in traffic.

The suction cup is easy to mount on flat and slippery surfaces. For the best and most durable installation, we recommend that you clean the surface thoroughly for both grease and dirt.

This is done lightly with mirror cleaner or similar. After that, the suction cup mount is ready to attach. The suction cup is with what you call quick release, so it is quick both to put on but also to get off again.
The suction cup is made of a TPU material which allows it to easily make vacuum and thus suck itself to the surface. Due to the soft material, it will not cause any scratches or scratches.

The mouten itself is made of black plastic and can be rotated in 360 degrees, so you can film from all the angles you'd like. 

Along with the car mount, you'll receive a leaky protective bag that potentially extends the life of your mount.

This mount makes it possible to film in the car.