Similar to Jacksons. They can take slightly warmer temps, and a bit less humidity since they are sub montane. But they do enjoy long misting sessions just as much as any montane. Keep supplementing to a minimum and focus on varied gut loading.
16x16x30 would be about as small of a cage as I would personally go but they would probably be fine in something a little smaller.
I have to add that my male boehmei is one of the most active chams I have despite being a fraction of the others' size. He is also the only cham I have ever seen slip under a closed door to leave a free range room. Be cautious, they're cagey little things. Much more comfortable on the ground than most chameleons as well.
I mist mine twice a day. They are very very active and they do walk across the ground moreso than other Kinyongia species. My temps go down into the 60's. there is a gradient in the exoterra during the day which ranges from 70 on the ground to about 82-85 under the basking light. They wander as they see fit but have a definite pattern throughout the day. They are much more placid than the tavetanas but do not like to be handled and will jump if you're not careful. I wouldn't free range them for this reason. If there is a way out, they will find it.