Purely a guess at this point since we have almost zero visibility into the current Wi-Fi environment.  Going solely off of DHCP statistics, I'd hazard a guess that we'll have about 1,500 or so clients but that will ebb and flow.   That first link you provided was one I referenced above.  We don't have any MX devices in our environment so if we go that route I'd need to use their 10 floor example as a starting point, but I'm not really seeing how much 'better' it's making the network by adding that complexity (even if I chunk up the building into three sections instead of floor-by-floor) versus using a flat /20 or /21 for the entire building.  I'd be worried that, although unlikely, clients might still roam from floor to floor while going up in an elevator and keep their original IP from the lower floor/section and we'd exhaust that address space while the upper floor/sections would be emptier.  Though I'm probably giving the coverage too much credit and that there won't be a 30-second period where the client would lose its connectivity. ... View more