Thanks all for the help so far. One thing I'm seeing, that may explain my confusion, is that all of these pics show rectangular tarps overlapped... my wife's will be square so it should be able to be pitched in a square, but my Claytor tarp as a diamond... I think that will be a problem.
I'm not so concerned with the spreading of the hammocks. I think I've got a handle on that (...we'll see about that when I get both hammocks and try to put them up)
We've also talked about getting one big tarp like the Speer Winter tarp, and probably will, but I'm concerned that we may not be able to get a good "storm pitch" if the weather gets nasty, but maybe the "doors" will take care of that. I obviously don't know since I don't have any experience with many tarps or hanging 2 hammocks.