More or less. Talking about object based audio in channel terms is hard. As I understand it, home Atmos can support up to 6 overhead speakers and would feed separate information into each IF they exist. If not it gets "folded" down into what it has to work with.Its a good suggestion, but it would take-away from the vaulted space to hang speakers. I thought about it briefly. BTW, are 4 ceiling mounts a different channel than 2? Is it the same output in other words.
When discussions turn to the number of overheads, my thoughts has always been to at least attempt to install 4.. Think of a movie where a starship flies overhead moving from front to back.
You can never have the properly presented experience with only 2 L& R overheads.
That said, We all can do only what is possible for our unique situations and have to live with that, doing what we can to get the best possible reproduction.