Hi,
It's correct that mibs are not necessary since all they actually do is associating the OID with a more (sometimes) understandable name. I'm the one who created those device templates that you are trying to use, and all you need is a valid SNMP community, and have your device properly configured for SNMP read access. SSH is not used in the templates. Check your community, and also SNMP version before trying again.
Regards,