Batteries can be held in a different room than the IT equipment and UPS inverters--up to 200m per the manual of the APC Galaxy VX.
So can have the more common water fire suppression in the day-to-day areas where people are more likely to be in, and have have non-water solutions. Water mist instead of 'traditional' sprinklers is also a thing in many places:
* https://res.mdpi.com/d_attachment/energies/energies-13-05117...
