The Management Server and Management Server Agent overrides are actually built-in overrides from Microsoft. Nothing to do with nworks.
And those overrides are definitely required - they are used for the agents that run on SCOM Mgt Servers. Essentially, the same agent runs there, as runs on all your other client servers. But that agent has a lot more work to do, so Microsoft included those overrides out-of-box.
You definitely should leave those overrides in place. And the override for nworks group as well.
Hope that helps!