On the Megacab there is one, maybe two (fuzzy memory)plastic push fasteners right in the center of the headliner that help hold it in place. Large plastic head the same color as headliner.
They have a set of fingers in above the headliner that you can't see to maintain the space between the headliner and the roof crossmember.
I studied the situation and decided that I would be far better off to gently cut the head off and deal with the remainder of it once the headliner was down. That was the right decision for sure. Not a mark on that headliner.
Those are a dealer only item and I had to order them. Not something a dealer would normally stock.
Not sure if the quadcabs have them or not, I would think that there might be at least one up there.