Hi there,
Neutral area is very important, but equally important is being able to supervise. I'm on day 4 of bonding a trio, and I've sectioned off a small 3'x3' area in the kitchen to start the bonding, mine are outside bunnies. I more or less sat with them all day the first day, and slept in the kitchen with them the first two nights just to be on the safe side, and this bond has been easy as pie compared with some previous pair bonds I've done.
Have you bonded before?