On the HSS Nodal test case, Network Devices tab, you can configure the MME to emulate up to 1000 Nodes. Each MME Node will have a SCTP link.
If you decide to enable the Multi-Homed option, each MME Node will have a primary and secondary SCTP link. You have to enable Multi-Homed on the SUT configuration for consistency.
Please see the configuration example below: