I have a new 2-car garage built last year. With a potential Model S, I'm looking at getting a price on installing a 240V 50A NEMA 14-50 outlet. Where would be the best place to locate it? Center front wall? How high/low? I don't know what/how the experience is with the location of the connecter on the Model S, length of the cable, if it's better to leave the cable on the ground all the time, etc.