Window vent visors?

I hate how rain just drips in when you open your window even a little bit, and was wondering if anyone has any experience with those vent visors..

I noticed they sell them for 99-04 Mustangs, but how would these even work with our cars, seeing that our doors don't have window frames? Would you have to roll your window down every time you want to open your door, so you dont hit the visor?
 
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