I have done the mutiple sleepers before, it feels great, and I have tried many diapers, I think it's just a waste of diapers, because if you intend on useing them you need to destroy them by slitting, so they drain from one to another, and then if you don't wet thru all of them there junk because the tapes are shot.
The best and cheapest way I have found is useing soaker panels, folded just the right size to fit in the diaper center, but if you go over the amout the diaper will hold the diaper won't fit right, and it can leak out and over the leg openings.
I use 2 microfiber towel panels folded if you go over 2 it's too thick, and very very noticable, but lots of fun.