Adding new device receiving snmp trap from southbound device

We’ve already had a platform can be set by snmp and can send snmp trap alarm. The southbond platform can’t add a snmp user. That means I can’t add device like adding other devices.
There is one question.
How do I add the southbound platform in LibreNMS to recevice the SNMP trap message send from the southbound platform??

Try adding it as ping only devices…but Im not sure that will work…