you have not mentioned if line of sight is possible, how far the "sites" are apart. if there is line of site possible there are many non-meraki solutions (even if mounting something outside a window and mounted to external wall) from site to site. There are point to point wireless bridges, many many options. Anyway if you are presented with a vlan as mentioned, i have not seen if meraki devices yet support dot q on q, i dont have end end meraki devices at home.
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