The Warbonnet UQs are, in fact, cut to be used when laying diagonally in the hammock. That way, it stays tucked up against your body, not the hammock.
I have used mine on a TrekLight Double and ENO Single, works great. There should be no reason it won't work on a Speer. It's a simple shock cord suspension; just loop around the whipping/knot at one end and loop the other end around the whipping/knot at the other end of the hammock. Done.
Only covers your torso, so you save a big chunk of weight. It keeps the core of your body warm and that seems to take care of the legs just fine. I use a thin pad under my legs or have used my pack when I did not have a pad. Great system! Taken me sub-zero a number of times now.