2 wires hardwire kit supposed to connect to the ACC fuse and grounding. Connecting to the BATT fuse or "always on" is dangerous as will overheat the dashcam and drain your car battery very fast. This is why 2 wires are not recommended for parking mode. What if you forgot to manually off the parking mode?

Please get a proper dashcam with proper parking mode that auto on/off if really want to use parking mode.

3 wires hardwire kit and a dashcam with proper parking mode works together. Not just the 3 wires hardwire kit alone. The dashcam has a controller that controls parking mode when detected the engine is off and will auto switch to parking mode. That's how it works. Also will detect car battery voltage level and cutoff when low voltage to prevent drainage.