If it was me, I'd have one Org in Meraki and then a seperate network for each building. Not sure what firewalls you are using but you can only have one MX per network so if you are you planning to use MX then you don't have a choice.   Seperate networks is also going to be easier to troubleshoot any issues. You cna use the same SSID's across all locations just make sure they use the same method of authentication  i.e. if SSID1 uses PSK at site A then it needs to use PSK at site B otherwise client devices will throw a tantrum.       ... View more