Turning down the transmit power of the AP might help in this situation.
I use the 2.4GHz band only for legacy/unimportant devices so I've turned its transmit power to the lowest setting available. All of the legacy devices are in the same room with the AP so this is not a problem in my case.
Since 2.4GHz penetrates through walls quite well this has the added benefit of limiting the radius of the coverage and to some extent improving security. But this is not a perfect solution (it's more like an unintended side-effect).
The 5GHz band has lower penetration through walls so leaving it on highest transmit power should be fine.
It definatley helps if you have space/property. If you live in a relatively close density (apartment, zero lot line homes) it very well may not.
I have some rtsp cameras. To keep them from being dumb and randomly roaming to like aps (and overloading the antennas and causing breakups in the stream)I setup different SSIDs on each ap for them so I can control what ap the cameras use and prevent bad roaming decisions.
This also means I have an SSID on each non overlapping 2.4 GHz channel.
However I live on a couple acres. If I’m interfering you are trespassing.
I probably would take a different approach on a higher density area, such as getting an AP with 2 dual-port, dual-polarity antennas dedicated to 2.4GHz and sticking them all on the same AP dedicated to the task, also assuming i would need to cover fewer doors and RSSI wouldnt be an issue.
Since 2.4GHz penetrates through walls quite well this has the added benefit of limiting the radius of the coverage and to some extent improving security. But this is not a perfect solution (it's more like an unintended side-effect).
The 5GHz band has lower penetration through walls so leaving it on highest transmit power should be fine.
I found the following article and its comments to be quite helpful: https://metis.fi/en/2017/10/txpower/