I think many have missed the salient point here.
You should NOT hang anything from the unsupported sections of the wall material. It just isnt smart. It wont last and may leave you with a large hole at some point that you wont be able to repair or cover because that wall covering is not available at just any Home Depot.
I only put fasteners (screws) into wall studs or crossmembers which are pretty easy to find by tapping on the wall.