Snap Vents

I'm wondering where the best location for these vents are. I have rectangular vents in my windows now but, when the car is done I'd like to get more air in not just out. I have seen a few different locations of them but I'm not sure which is most effective. If just based on visual preference I would go in the rectangular vents the way the gulf cars (atleast # 9 and I think 6) had them.
Any experences, pictures, and advise will be greatly appreciated.
John
 
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