Oh good, glad you said best and didn't mention anything about the price

The Atmos speakers should be tonally the same as the surrounds, that way the sound profile is seamless as objects move around the room. There are plenty of modules available that sit on top an existing speaker. The Klipsch look like little screamers. If you ask 100 people you will get 100 opinions (if you go to AVS Forum you will get 110 opinions)
https://www.crutchfield.com/shopsearch/atmos_speakers.html?&pg=2I am a fan of Triad speakers, you may not have heard of them but home theater speakers is all they do. Triad is sold through a professional dealer/installer network. I have 2 Triad OnWall Bronze Surrounds and 4 Triad InWall Bronze/4 Surrounds as my in-ceiling Atmos speakers. They work very well with my Anthem AVM 60. The speakers never call attention to themselves even though the living room is filled with sound so your attention is always on the action on the screen.
Triad has a balanced sound, the opposite of Klipsch. I stayed with the Anthem ARC Genesis curves which you can easily tweak to make a custom profile based on your room and hearing preferences.
The Triad InRoom Bronze or Silver LR-H would work out perfectly in your situation. The speakers have a clean classy look, you can start with 4 and 6 would make a totally awesome sounding room.
Triad speakers are made in the USA using top quality drivers, all levels (Bronze, Silver, Gold) are top quality, the only difference is the recommended room size.
https://triadspeakers.com/product-tag/atmos/An in-depth review of the Triad Bronze LR-H, price is $1000 each.
https://www.soundandvision.com/content/triad-inroom-bronze-lr-h-speaker-system-review
Dawn Gordon, a Triad installer can answer any of your questions
https://www.avsforum.com/threads/triad-owners-thread.921427/Triad only sells through a dealer network, I located a dealer that sells Triad speakers at 10% off, no tax and free shipping:
https://avscience.com/Many Triad speakers are available on eBay too.
> Download the Triad 2016 Catalog with Prices here <
Trinnov and Triad speakers had a demo at CEDIA 2019 in a free standing room, from watching the the videos there seems to be very little to no sound leakage. All the Triad speakers are hidden but which models used are not specified, they may be Triad's Inwall speakers.
$300,000 11.4.6 dts-X: PRO Demo w/ TRINNOV Audio Altitude 32 & TRIAD Speakers at CEDIA 2019