Is there any way I can configure a mikrotik, so when i conect to one of the SSID of the Unifi, the mikrotik redirect me to one router or the other one (depending the SSID)?
You need to create a vlan interface for each router and linking it with the vlan in Unifi.
I think the situation is about words.
What you mean as redirect i think is about routing. Redirect is most use for firewall rules, in this case is not necesary
Inside interface ether on mikrotik create 2 vlans linking with vlans in unifi. Then create rule in order to send the traffic in some direccion, or you could make a routing-mark.
Any help on how do I have to do that?