This version of the template drawing shows two ways to meet the template without going past the rear bumper.
Aero wizards - what do you see as the plusses/minuses of these two?
Here are my poorly educated guesses:
Blue line is intended to be horizontal. Would allow a fairly clean view out the rear window. I think I prefer this version but consider the purple line one also.
Purple line would add downforce?? And I believe generating that downforce creates its own additional amount of drag? Or are the added downforce and drag very small due to relatively low pressure in the area just above the trunk lid?