I had it right on the roof to start with. I found it to the most effective were I have it now. It is completely adjustable so it can be positioned to the floor to your body or to the back. The passenger has there own so they can put it were they want. The centre one can be put on the roof arnd angled where ever you want it. To find the most efficient spot for you go for a drive and use your hand for a deflector. You will find the sweet spot for you.
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