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So you mean close of the bottom, underneath the top surface of the spoiler, to prevent air exiting thereby causing a high pressure area that the air stream sees as similar to being a kamm back of 12 degrees?
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Pretty much.
I was thinking of a half-tonneau in a pickup truck. It isn't like just having the tailgate up instead of down because there is a recirculation in the front half of the bed that moderates the flow (some how). It could be a sock that fit's over the hoop front and back.
The perforated part would be for rearward visibility, and perforated base plates are a thing so why not?
aerohead and I saw an example at the Darko wind tunnel where a wall of welded wire mesh affected the laminar flow in the tunnel,
around a corner.