69427
The Artist formerly known as Turbo84
Yes, the reason for it being so high was to get into the smooth airflow above the roof where it could be effective, instead of down in the rear deck turbulence.
I agree that having it that high improves the wing's efficiency, but I've also heard that it needed to be that high to allow the trunk lid to fully open. A nice side effect/benefit is that the substantial vertical area on each side support moves the center of aerodynamic pressure to behind the c/g, making those cars a lot more stable at speed than their contemporary competitors.