Correct the ideal Atmos is all direct radiating, The on wall versions might be worth looking at as they would protrude into your room as much as a full bookshelf. If you can place the surrounds within a couple feet of ear height directed to you should be fine. Another way to go maybe 5.2.4 without rear just sides.
Sadly most any multi pole speaker gives to much of a spread out sound for ideal Atmos bubble.