I had a set of XTC baffles from Crutchfield for my 6x9s in the back. I got them because I thought they can help with the pressure in my trunk from the subs I had in there. They were rocking the cones pretty bad.

So I didnt really use them for protection from water or dust. Using the baffles basically creates a shitty enclosure for the speaker. I think how the speaker reacts will base heavily on speaker and the size of the baffle.

I wouldnt bother using them. As long as you have the plastic wrap that covers the electronics in the doors (comes from factory and uses that super sticky adhesive) , you should be good to go.