I only have three meraki minis but I was wondering how they scale if you have more of them. One of the Meraki FAQs is:
Well, you know how I like equations. Now that Google finally added charts to "Google Docs & Spreadsheets" (my, that is a long name), I present pretty chart: Throughput through meraki mesh. Summary: wifi is very fast and you can probably get away with a few hops, but you need gateways every so often.