In the act of chasing a very moderate wind noise issue in my car, I've applied the foam to everyplace suggested by other members and even a couple more. Granted, my car never had the whistles, thrumming or any of the more obnoxious noises reported by others which would have been understandably very frustrating. As anal as I am, I just had to chase down any noise issue I thought could be improved.
In addition to all of the recommended locations, I also applied foam in all the similar locations in the rear doors anyplace it would fit.
I also installed a rubber strip on the leading edge of the rear doors where the they meet the closed front doors to hopefully control any air movement sounds in that area.
The bottom line is that I couldn't quantify how much, if at all, any of the applications made much of a difference individually. I can say, though, that the final result has been pretty satisfactory. I'm now quite happy with the that the wind noise level is as good as can be expected and I'm happy with it. Also, the doors open and close with a nice thud that surpasses the even the pleasant sound of our G80s doors.
I haven't been able to do any long distance highway trips, but so far the wind noise seems to be totally under control. The most noticeable remaining noise is probably tire noise that's made more bothersome by the open box shape of the interior of the Palisade body.
I hope all of you that pursue the black foam remedy can be as satisfied with your results as I am. Good luck.