Toyota Ruthorford and Bond installed my system. They put the battery inside the glove box. Good place to hide it and can easily turn it off rather than reaching underneath my seat though under your seat has advantages too.
I was considering getting it hardwired as it's twice as fast to charge, but I don't use Parking Mode all the time since I live in a safe city suburb. My car is a Toyota Aqua (Prius C) Signature Class vehicle (2013 model) which I got from Toyota NZ October 2018 which comes with a 5 year Toyota Signature Class warranty, wooo. My first car for my budget with a warranty brought from the manufacturer themselves. However If Toyota or Toyota Authorized installer didn't install the hardwiring, that would void my Toyota car warranty, so kept it simple and since I don't need the unit powered all the time but do have it on when I'm driving and sometimes in parking mode where it records random people walking past lol.
Overall it's a solid dash cam, the best currently on the market. Better than any Navman product. Though Navman is fine for GPS.