*** FOR INFORAMTION PURPOSE ONLY. CHECK LOCAL FIRE-CODES. ***
Mainly you need:
- Emergency Power Off
- A sealed room with positive pressure
- FM-200 based Suppression System
- Water based backup suppression system
Outside the main door you should have a Class C fire extinguisher that is easy to grab on way in.
Check out Novec 1230 from 3M. It's a Non-conductive liquid fire suppressant which evaporates harmlessly.