I hard wired my 535I and did the M2 the same way. I ran the wires out of the bottom right air scoop. The wires push up into the scoop when not in use. You will need to add some length to reach though. The charging nuts come off to reveal studs that the rings go right over.
And... I have a small plaque I set on the drivers windshield wiper to remind me to unplug it.
