@GarthI have a different brand of deflector than the one originally posted about, I run the AVS Bugflector II which I installed with the included screws instead of the option of 3M tape.
I will add that with the way I secured the Kayak and Canoe, the strap down to the front tow hooks and rear toe hitch were not significantly tensioned. For me they were to stop forward / backward movement of the boats while the major tie down tension was the ratchet straps securing the boats to the roof rack.
If boats were mounted similarly, I would not expect 3M installed hood deflectors to be a problem, the biggest benefit is not having the front tie downs making contact with the hood paint
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