I have my 2 good sleepers in the main room of my basement with a white noise machine, the banshee screamer in his own room with the white noise machine, the babbler in her own room with a white noise machine and my own son in his room with a white noise machine. I have a monitor in the basement and a monitor on the top level where the bedrooms are. I stay on the main level during nap.
I agree about missing the window and them having a second wind. We have lunch here at 11, clean up/free play/diaper changes afterwards and all are in their playpens (son in his crib) by 12. I make them stay in their beds until 2 pm but honestly, most days I am waking them all at 3pm :-)