So: yes, one Network per site... Not just because you then get 15 SSIDs for each site, but also: A Network can only be in one time zone - if you have lots of APs in different countries, you will probably want accurate local time for each. If you ever want to deploy the MX Security / VPN / SD-WAN appliance, you can only have one MX active in any single Network in Dashboard. (MR + MX and maybe MS switches too, all together, then suggests use of Combined Networks, per site, as @Uberseehandel mentioned)
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