One thing you might give some thought to is future upgrades/repairs.
I would make sure you can get BACK into that area (if necessary in the future) without having to tear your cab apart.
You are going to be the best judge of whether it works, or not, though.
1) Do you get decent sound from them?
2) Is there any buzzing in the mount system at higher than normal volume, that needs to be taken care of before you mount the panel?
3) Is the sound STILL good after it's mounted?
If all this is OK, you should be good.