RouterOS's SNMP setup is a single command or a short menu in Winbox, but a few defaults are worth changing before exposing it.
From the RouterOS CLI, enable SNMP and set a community string that isn't the default "public".
/snmp set enabled=yes /snmp community set [find default=yes] name=linivoRO
RouterOS lets you scope an SNMP community to specific source addresses; limit it to the sensor's IP rather than the whole management network.
/snmp community set [find name=linivoRO] addresses=10.20.0.50/32
MikroTik's MIB reports interface counters and basic system health; for full flow-based visibility, RouterOS also supports NetFlow export, worth enabling alongside SNMP on anything acting as a real routing chokepoint.