You might want to do a little research on the Kia Telluride forum. I believe the Towing Package includes Nivomat auto level shock absorbers. It seems there are some issues.

 

I pulled the nivomats out of my Yukon Long ago because they were terrible. Ymmv, and I know it’s a different vehicle but I wouldn’t choose to Put them to a vehicle of mine.
aren’t people doing air boosters on this car?

 

I can't find any reference to Nivomats that are made for Atlas.
Not to say you could not make something work - but it does not appear that there would be an easy way to set the height correctly.
The springs need to be swapped out with something that would work with the nivomats.
This is likely to be a tough project.
Perhaps it would be better to look at some airshocks with a controller.
It might not be too bad to get electronic leveling and adjustable rear height...