We provided FM200 systems to protect these cabinets as the clients request. The cylinder was floor mounted adjacent the cabinet this was connected into the cabinet using a flexible hose. Other scenarios we've carried out in the past, if there's enough space within the cabinet would be to mount the cylinder within the cabinet with a discharge nozzle mounted directly ontop.
An extinguishant panel was provided on an adjacent wall with detectors hardwired to the cabinet to trigger to extingishant agent.
It's a little fiddly getting cables etc in, but if done correctly it looks good and our clients have been very impressed. Incidently they had several other companies in to price the same job and coem back with wierd and wonderful ideas, and indeed some said they couldn't do it!