Mine have always napped in shared rooms. We don't have a large house and so over 2's go in my bedroom and under 2's in the guest room. Because it's always been that way, there's only one new child at a time to adjust.

I think I would be tempted to start now. Moving homes is a big change if your client's are following you. Although you and the routine will be familiar, the environment will not be. Start now getting them napping together so it's one less change down the road.

The only advice I have is to be stern. If you need to go into the room and remind them it's nap time and that they shouldn't be banging their feet, do that. They know you, they know you mean it, they know what's expected. I have 6 children. 4 over 2 and 2 under 2. The newest baby bangs his heels on the crib matress when he wakes but I just go in a re-settle him if it's really too soon to get up. In terms of them falling asleep, I've never had an issue but that said we go outside for as long as possible in the mornings so by the time they come inside, eat, faces and hands washed up, diapers done, it's rare if anyone is still awake in a couple mins. Wearing them out before nap time is always key.