Vortex generators have been at the center of a vigorous do they/don't they debate on these pages, and not having any I can't comment one way or the other. To me it looks like there should be some definite improvement but the placement is what will most determine how much benefit you experience. That'll take some testing. If you can lay your hands on some VGs, stick 'em on with 3M Command strips for easy attachment/removal and do some A-B-A coastdown tests.
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Lead or follow. Either is fine.
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