I have a FR Class C with the same roof. I think your photo makes it look deeper textured than it is. There are different thickness of the 3M tape, some of which will handle that roof. I used some on my roof (see link below).
Having said that, when all was said and done I chickened out and put one screw through the foot of each mount. Then dicor over the screw and the rest of the foot. I think the tape would have held, though. I just decided why chance it.
Here is the tape I used.