The armored biters mod does not allow you to capture the armored biter spawners :(
We would need the mod to include a "captive-armored-biter-spawner" entity and a way of capturing them.
You could create a scenario in the map editor, place an "armored-biter-spawner", and set it's force to "player" instead of "enemy". Then it will start spawning friendly armored biters, and all of the controls this mod includes for the friendly biters will still work with armored biters <3