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I put a roof wing on my S-10 and it's flat, no angle.
There is a slight air gap between it's leading edge (beveled down 45 degree angle) and rear of the cab's roof edge.
It works to provide some down force via the air slot going off the seat of my pants feeling.
The thin sharp edge of it's end is a clean release edge for the air.
If I were going to adapt an SUV roof spoiler I'd look for one that's a bit neural looking in it's angle, maybe slightly downward and has an air slot.
I took photos yesterday of the only SUV with roof spoiler that directed the air upward, but it was just at the two ends as if to purposely induce a vortex. I'm sure that is a model specific solution from many hours of wind tunnel testing and perhaps would avoid it. I will try to post the photo later.
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