Randomized Spawn Points/Rooms

This seems like it should be a common topic but for the life of me I can't find anything relevant no matter how much I search.

I'm building a map with a number of spawnpoints, and I want players to spawn randomly at points rather than sequentially. They're spread out and placed in varied locations in the map.

I explored the sdk 2fort sample to try to reverse engineer how the dual spawnrooms operate but from what I could see they were just normal spawnroom brushes with normal spawn entities.

At the very least I'd like to find out how the multiple spawnrooms work if just for future reference.
Thanks in advance.

That being said, on my map, of the multiple rooms and 36 potential spawnpoints, it only ever selects a single one repeatedly.
Is there a naming convention required to make what you said work?

Alright, I was certain that was going to work because I recall I had encountered something similar in the past, but it didn't this time...

Still dropped the player at the exact same spot even with unique, non-copy/paste entities.