What I always do is wait and then single out lone soldiers first. Focusing on one's on a different level in a base (like higher on walkways or lower being on the ground). Then I single out the soldiers nearer AMP suits, and once there's yellow, I move to a different section of the base. I would not suggest trying to rush them as yeah, you would get killed a LOT lmao, it's so much easier to pick off the easy ones, then do the AMP suits last for me anyways. I use the same method for the no walls bases too, taking out the soldiers on the outer most walk routes.
|| Once you reach the upper plains and get the ability to fly on an ikran there, I'd suggest going and finding all of the big tarsu flowers that unlock special abilities for you as I'm sure there's a ancestor ability to be able to see the paths that they take, much like how the wildlife scents work. That's a big game changer for stealth. ||
I would also suggest going around and touching bellsprigs and the tarsu saplings all in kinglor using map genies interactive map for the game as soon as you get your ikran, as that's what I did and I really needed all of those. It was so good to have a lot of health.