IMO Hushmat is better than Dynamat because the outer foil on the Dynamat is very sharp whereas the Hushmat is not. Yes, it adheres fine.
I put it on the firewall, floor, package tray, roof and doors. Putting it into the doors was not an issue at all. The roof was the worst because as you are trying to line it up, it is trying to fall down. You don't want to stick it too hard or you cant get It back up. I will say this, it makes a big difference in sound and vibration. when you tap the roof now it sounds solid. I still need to put it onto the inner sides of the doors once I get the glass back in.