Yes you need to hard wire to your car to take use of parking guard features, the micro power source in dashcams ( capacitor or lipo battery ) are just there to finalize last recording in case of a violent event.
So it is your car battery that will have to take the load, and if you only drive 1 hour a day, then it will be hard to keep power for the remaining 23 hours of the day ( assuming you want to have parking guard always when not driving )
So with just 1 hour of daily driving and 23 hours of parking guard, then your car will have a hard time keeping up the charge, also since you are way up north where it get cold in the winter, this impact your car battery performance too, so for sure you do not want to use a low cut off voltage in the hard wire kit, cuz then you could run into starting problems in winter.
ALSO ! i assume you see some form of rain / snowfall and frost in winter, this will cover the windscreen / windows and block view from cameras, though they do get hot and can melt some,,,,, and so draw attention to them self.
If your problem is at home you are better off with a CCTV camera on the parked car, and then just use parking guard at work or when shopping, personally when i soon get to try parking guard out i will just use it on a 1 hour or so timer as that cover all my parking in regard to shopping, and at home i have a CCTV camera on my 2 floor balcony door aimed at my car parked down below in the back yard.
I personally don't see a need for long time parking, but if i run into it i can just turn the timer up for that one time.
You can also put a extra battery in your car that just serve the dashcam and not the cars own start / drive battery, but this still need to be charged too, and if you don't drive much then it can be a issue.