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I've always thought that the car could just have a hinged coroplast skid plate that hangs down with a radiused edge at the rear.
As the car backs out of the driveway, the plate would make contact with the ground and be pushed upward.
When out of the driveway, the plate would lower with the force of gravity and increasing air pressure would provide enough lift to raise it to the perfect angle that the airflow finds optimal.
Two cables would hold it on.
I should add that the CFD images may not be totally accurate, and this entirely due to my lack of understanding of how to use the program.
Sometimes artifacts appeared, and the tests contradicted themselves.
I fully encourage others here that are CFD pros to run professional level testing on the car.
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