I would recommend WifiWave2 products for multi-AP solution. This should include all 802.11ax MikroTik devices and hAP ac³.
And, I would even recommend to go with multiple access point with ethernet backhaul. Multiple access points with weaker signal would provide much better experience and speeds, and together with total radiated power being less, than one access point with strong signal, that is trying to penetrate multiple metal-reinforced floors and walls. And, I don’t like grilling nearby people as well, so I would not go over EIRP limits.
With WifiWave2 CAPsMAN it’s possible to setup 802.11r/k/v fast roaming.
I personally have a good roaming experience with combination of hAP ax³ as edge router and WifiWave2 CAPsMAN and hAP ac³ as WifiWave2 CAP.
More details in my other forum post.
And, I plan to extend this setup with one extra hAP ax², due to layout of property with lots of metal-reinforced concrete floor and walls, plus I also want my indoor APs to cover nearby outdoor area. And, waiting for wAP ax (or else wAP ac successor) to cover distant outdoor space.