Yes, modular ceiling-mounted automatic extinguishers are highly effective for localized compartments. They contain a glass bulb (typically rated at 68°C) that automatically bursts when heat rises, releasing clean agent gas (HFC-236fa) directly over the panel. However, they are NOT a replacement for a full room gas flooding system (like FM-200 or Novec 1230) if your building rules mandate it for high-volume IT rooms.