My educated opinion is that they'd make worse aero up there.
Yah, that's me, the only one that drives in xwinds all the time. Well I've seen the raindrops blow across the windshield, and they move up AND across, xwind or not.
Then, for the umpteenth time, I've also noticed on my car that the bottom 1/4 of the windshield is in a relatively static bubble as evidenced by the drops just sitting there.
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