2021 AND UP TESLA MODEL 3

6-8ga wire that runs directly from the battery, to a module in the driver kick panel. There is a stud on this module you can ring terminal the power to

Grounded in the driver kick panel. There was a threaded spot there already. (M5 or M6, same as the power stud)

Ignition in the driver kick panel 18 gauge Red in pin 44 of a 48 pin plug shown with probe in it

Device location (Make sure your below the airbag curtain)

Camera Location ( Bottom of Camera should be even with the bottom of the Dot Matrix)