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I think it depends on the design of the car, I seriously considered doing something like this to my 04 Civic Sedan, but seeing some “Shape Studies” that show a large radius roof to rear glass transition area returning very good Cd results got me to wondering if Honda hadn’t very carefully “tuned” the shape of everything on the rear portion of my car to minimize weird pressure gradients that would cause vortices to form. This it would seem to be not too difficult to do, and would account for a fairly good Cd value I get for a fairly large compact car.
IN other words, doing something like this could very well mess up something the designers of your car crafted very carefully. Each case would of course be its own study.
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