I spent quite a few years building out server rooms, large and small, in California. They were all braced against seismic activity, even when installed in close

I spent quite a few years building out server rooms, large and small, in California. They were all braced against seismic activity, even when installed in closets. All the critical equipment was mounted on rails and bolted in. Yes, there were the occasional towers sitting on shelves and rack mount systems that were not secured against sliding out, but in general, the server rooms were the least likely places to get hit by falling equipment.