Thanks for that - im thinking of having them hard wired and fitted. it would be beyond my ability to do that !You could wire them to the 12V socket, or take them from a fuse in the fuse box, but make sure it is a fuse that cuts out when car is switched off, then cameras are not recording.
Also make sure the connection to the dash cam, can be removed easily and seen that it is removed, as it is now well known that when a car goes in for a service or repair many dealerships do not want to be seen working (do they work hard LOL), and they remove or disconnect the dash cam. Best to tell them it is diss-connected when at the service desk.
Its a strange world we live in now
Note some other members may come forward telling you of their installation.