I'm quite lazy with this. If I want a territory to be neutral, i swap buns around for a few weeks. Like Chocolate's two tier. It was hers for a while, so i swapped it, so it was Cracker's. They had it for a few days each, so they get used to each other's smell. I introduced them in the bath, then put them both back in the two tier - where Cracker had been last. Chocolate's usually territorial, but it worked. (Actually, she probably just decided to give in, so she could stop playing musical cages!!! :lol: )
I don't move them again though, once they're settled. (Had a swap round yesterday, so i could get another foursome together).