Help to add Zyxel router

Hi, I am trying to add a Zyxel EX3301-T0 router to my HA environment. Up to know all of my devices have ready built integrations.
I’m considering using SNMP and have used snmpwalk to access the OID’s but am not sure which (out of the thousands) OID contains the right data.
Any help will be gratefully received.