Mine is attached at the sides of the cowl piece, but does extend under the hood. The hood just makes sure it doesn't come loose and fly off on the highway.
Maybe you could attach some thin metal bars to it to keep it from flapping.
I made mine with a radius in the middle to help visibility, you could do the same to yours too. It doesn't take much.
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Winter daily driver, parked most days right now
Summer daily driver
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