I added a metal bar I had to provide a
point about a foot in front of the roof that I would use to attach a wire
to that would support the standing skeletons by going thru the little
plastic loop on top of their head.
You could have
that attachment right into the roof or just use a short piece of wood.
See
photos above and right.
You can see wire (which
was later painted black) well in photo below.