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I'm not sure your cause and effect follow each other.
Correct that the grille is near the stagnation point. (more on some cars than others) A rear block will cause air to "pile up" in the blocked cavities. The rest of the air will flow mostly smoothly over those pockets of air. A rear block should work nearly as well as a smooth outer block.
You do have to get past that pesky problem of the air pushing it in and then leaking around the block. A front block doesn't have the problem.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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