I have the VIOFO A129 Duo Pro. It is a 2 channel front and rear camera set up. If someone is telling you park mode will drain your battery, that is true if you have a cheap cam. The A129 Duo Pro wiring kit has a "breaker" that if your voltage goes below a set amount, it will turn the camera off automatically. So, it's no worry!
USA: https://www.blackboxmycar.com/collections/viofo/products/viofo-a129-pro-duo-2-channel-dash-cam-with-gps