There are a few different ways to mount an action camera in a car. Perhaps the simplest method is to use a suction cup mount. This type of mount can be attached to the windshield or any other smooth, flat surface. Another option is to use a dashboard mount. This type of mount attaches to the dashboard with an adhesive pad. Dashboard mounts are generally more secure than suction cup mounts, but they can be more difficult to install. Another option is to use a seat rail or headrest mount. These mounts attach to the car's seat rails or headrests and provide a stable platform for the camera. Seat rail and headrest mounts can be more difficult to install than other types of mounts, but they offer a great deal of stability.