We have the same problem, Boots is getting bullied by Boo Boo and Bailey. To make it worst if they look at her she screems.Before Boo Boo Boots was chased by Lenny, Roz, and Egypt, since Boo Boo has been there they have stopped. Baily (12 year old Munchkin) is nick named the "grumpy old man" and will take a swip at almost every one. By luck he is a declaw. By the way he realy hates Chessie. Sorry but it is kind of fun whatching the boxing as both are declaws.
As to the pee and poop. We find it in front of the basement door, they are not alowed there, the front door, the door to the TV room and in the bathroom NEXT to a litter box. The poop can be found almost any where. The worst place in under the head of the bed. So every once in a while we lay down just to get up move the bed and clean at midnight.
With 20 in the house there is always some thing going on.