I feel for your cats. One b would be so much easier; two bs are a pack who can drive a cat nuts or kill it. There is nothing most bs like better than chasing a furry creature either in play or to destroy.
How much experience do the cats have with agreeable dogs? All the cats I have brought into our basenji house have grown up with dogs and so the new dog was no big shock, although there was some adjustment for sure.
Do the cats have all their claws? Will they stand their ground and scratch if the dogs try to mouth them? Critical! Otherwise you are endangering your cats lives as bs love to grab and shake, which breaks a cat's neck. Only takes a second. I watched it happen a few years ago when a neighbor's cat went into a yard two houses down because his (the cat's) owner was over visiting, checking out some flowers. The cat came walking toward us and the Dobe that lived there killed the cat in one shake. One of the reasons I would never let my cats outside by themselves.
The cats will go through enough stress just moving; as you know cats HATE that.
I like the idea of keeping the cats in a different area of the house. But where will you be? They need you too, not just space.
I've had basenjis for 36 years and if the pups grow up with cats they can do great together.
Go slow and help the cats adapt to the new house first. Give them lots of love and attention.
Then have the bs in crates and let the cats explore the rest of the house. Then keep them on leashes. The worst thing that can happen is that when they meet the dogs chase the cats. A moving cat is a true thrill for most bs. Cats that stand their ground, hiss and growl impressively and scratch if need be can train a dog to respect them.
If you have to have them where the Bs are, make sure a cat tree or something out of basenji reach. We have armoires, high counters, chest of drawers and cat trees in literally every room. Remember bs can crawl under most beds.
I wish you the best. Hug your cats for me!
PS. Bs love to eat cat poop!