How to spawn multiple prefabs at the same time through Network Manager?

I know that you can spawn a player prefab by giving a prefab in the Inspector shown above. Is it possible to increase the number of prefabs (prefabs that are all different from each other) here, so you spawn multiple player prefabs instead?

Use case: A level where the player controls 3 different units at the start in Scenario Campaign.

Or the Inspector is hinting me to use this?



Then again, I'm not sure...

How to spawn multiple prefabs at the same time through Network Manager?