It's complicated by the fact that the flow near the A pillars, where the wipers would be, isn't going straight "up" the glass (parallel to the wipers); much will be crossing them at an angle, going around the A pillars onto the side glass. It's possible they could make things worse up there.
The safest place for a vertically parked wiper is in the dead center of the windshield (and even then, only when not driving in crosswind conditions, which is kind of rare).
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