I havnt hard wired mine. My EX has 2 usb power sockets for the rear passengers rated at 2 amps. Once I had figured out how to route the wire from the dashcam down to the dashboard area (necessary anyway to hard wire or use the front power sockets) it didnt take much more ingenuity to route it as far as the rear usb's. . I continued down to the front floor well, then along the sill hidden under trim as far as the front seat, then hidden under the carpet beneath the front seat, emerging next to the usb sockets. But there may be alternative routes .The petrol tank is located under the front seats so dont drill any holes
My dashcame came with an extra long power lead,which reached with about 30 cm to spare. I think it was 3m but may have been 4M, so if buying a lead its best to test measure, rather than having to use an extension lead.
Edit 3/10/2024. I have just routed the cable as described for the dashcam on my new 2024 Jazz. Only then did I discover that later cars now have small type c usb sockets at the rear , not the large type A required by the dashcam cable.

I had to use an adapter. But even if I had noticed in time I probably would still have gone ahead. It works fine. I already had an adapter but have ordered a spare for £1.69