Let’s be honest, Mikrotik is a different UNIVERSE! I use them as well for various things. One as an AP and it’s great for all my N and lower HA stuff (dedicated.)
@MEarly I’d definitely recommend the Archer C7 for your use case. Having two AP’s and a “real” router would be a better solution but then you go over budget.
Ubiquiti is nice too, but again, probably cost more than you want to spend right now.
More important than a mesh or multiple AP setup is how you use the radios. Make sure anything AC is on 5Ghz AC band. Then anything N and lower on 2.4Ghz. Multiple AP’s makes this WAY easier. I have two AC routers with the same SSID’s and roaming works great between them. Different bands so no contention. Then the 2.4G Mikrotik for HA, and a second 2.4G SSID on the AC routers for non HA old stuff.
Check your Zigbee band, and place your 2.4G devices in a non overlapping channel as well, if you can.