How is Monitor presentation determined during "Add Monitors"?

How is Monitor presentation determined during "Add Monitors"?

When I'm selecting "Add Monitor" under "Device Template" what determines what Monitors are presented?
I've attached a screenshot showing what I mean.

In my example I've added a couple of mibs for Cisco ASA firewalls and would like to have them presented like this.
Instead I have to add my own monitor from the "+SNMP" button. Can I somehow get Opmanager to inspect my custom mibs for monitors to present in the list?

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