don't know about the Roof helmets but my wife and I have been using the Q2 Multiset for a couple of years now. I also have it paired with my phone and people can hardly tell that I'm on the bike.
I use the q4. there are two ways to mount it. one is a pinch type that slides under the padding and outer shell. the second type uses a 2 sided sticky foam pad that will work with any helmet.