I tried to use an ATMOS 2.2 TV with a 2.1 soundbar & it was such a conundrum, because the 2.2 in the TV sounded great for Presence, but there was NO bass response.
The soundbar had the bass response, but not presence.
Getting the two to work together was only accomplished via bluetooth & then there was always a faint out of sync issue, no matter how much I tried to adjust for it.
Eventually I went ahead & got a soundbar that's capable of ATMOS & DTS:X, much happier now.