it depends on view, dude, you may sit on wrong side for this car ;-]
but I was also suprised to see a kid on the driver seat (in my normal thinking) on the higway, not nowing he came over from UK...
so let me suggest a porsche carrera 4s for German-Rental, there you can use the tip-tronik on the steering wheel.
then side doesn´t matter and you have a justification for your wife, to spend a bit more money ;-]
By the way the following sign on highways says "welcome to germany we have no general speedlimit" ;-]