I'm not an audio engineer, nor a major audiophile. I did buy the SoundsGoodStereo "Stealth Plus" Kit (The $2200 one) and finished installing it rather recently. The way these trucks come as stock for $80-90k is ridiculously awful. Speaker Count is not something they should have focused on and rather delivered us a better stand alone setup.
With the behind the seat enclosure everything was essentially plug and play after figuring out how to remove the seats and properly trimming the back piece of wall carpet you see on the product description page. The bass increase is substantial, the sound is so much better, and I feel like I can hear more of the range of the bass and not just the trash that the stock enclosure could do.
I'm considering doing a writeup for the install since SGS doesn't have any install vids yet for the 2021+ Raptors and I wanted to take more of the sound deadening mat that I have and place it back there too.
Overall I really like the product they sold even though I had to wait several months for it to arrive. The package came and looked amazingly packed, not damaged, and it came pre-tuned so that was a major plus for me too as I have never done anything related to car audio before. I still need to install the sound blocks and more deadening mat in the 4 side doors along with those plates, but thats a problem for me on a weekend I'm not busy on lol