Whole campus access network through site B, so if disaster strikes there, all user access down anyhow. Proper server rooms at site A and C, B might fit a 2U. More worried about nodes going down and power outages.
Read up a bit more and now understand we need support for a "stretched cluster". Sounds like one needs the VSAN advanced license. Wonder if this can still work on the "essentials plus kit" and if there are other HA limitations. We basically need to have HA hand over between sites, and this happens every few months.