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So my tonneau cover is on Order. Wife heard me yammering about tonneau covers and mpg’s. Long story short an Arrocap/Shell is out of the question for me
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no drilling in the cab for me,
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I don't see much of a way around your [wife's] prejudices.
If you came to us before the fact, we could talk about
half-tonneaus,
boxed cavities and
perforated base plates. Those discussions are now moot.
All we have to work with is a picture of someone else's tonneau cover and a misguided assumption that a 3D flow field can be reduced to a simple 12° angle. By all means go ahead and [just] do it. That would be classed as wake filling. Base pressure is exerted against the rear face irrespective of it's angle, you'll just spread it over a larger area.
Here's is what I would do:
This is half-way between a half-tonneau and a spoiler. The line from the back of the cab to the top of that
3rd 4th taillight is...
wait for it...
12°.