Hi there I have very much the same setup in my house.
I have my main mikrotik router (previously a hex router and now the RB450Gx4).
It is connected to a managed 24 port switch from one port which connects to one capac and another managed switch in an entertainment area.
The Router is also connected on another port to a managed switch in the basement which then connects to another capAC.
Since the capAC is capable of recognizing and tagging frames, I don't think it will be an issue to have unmanaged switches between the main router and your cap acs.
The problem is that the vlans will be sent out every port on the unmanaged switch but if physical security is not a concern then there is no risk.
As per MKXs comments, there may be limitations on the unmanaged switch but that is beyond my scope of knowledge.
As for setup my capacs have three networks
a. smartdevices on 2.4ghz chain
b. private wifi on 5ghz chain
c. guest wifi virtual on 5ghz chain
I have vlan11 for private wifi
I have vlan 10 for guest wifi
I have vlan20 for smart devices
(all my traffic is on vlans).
Setting up your network and router for all vlans using bridge vlans is the easiest method to setting up your network and highly recommend using this resource as your primary go to source!! Basically any port on the router or the capac going to your unmanaged switches would be a trunk port.
There is also a MT wiki source that is not too bad and you may find useful.
Especially if you do not want to use a vlan for your main network and therefore you will have to pay close attention to diagram #4 which shows ether3 as a hybrid port (which would be required to send to your unmanaged switches).
Lastly, suggest you provide a diagram which helps clarify the intent of your network.
When you do have your router config and capac config advanced to the point of being useful for us to analyze please do so!
/export hide-sensitive file=yourconfigjun26
I'd rather manage rats than software. Follow my advice at your own risk! (Sob & mkx forced me to write that!)