Update - for anybody contemplating IOT / Chromecast / Sonos / Multicast IP TV
The multicast reflector that Sonos-style deployments require does not play well with the IGMP-proxy that the TV streaming needs.
I don't believe we can ignore this stuff.
I bought a light bulb the other day, without really looking, but when I checked my receipt I did a double-take . . . it is "smart" and intended to be controlled in conjunction with lighting devices by some IOT hub. This sort of use is bound to become normal all over the place, homes, offices, warehouses, factories, you name it . . So I hope Meraki is not going to put it on the back-burner; we need to be able to isolate this sort of kit, but still be able to control it from devices with access to the secure VLANs.
I have't begun to test NO-NAT yet, as there are some unresolved issues with respect to how it will operate, and what will do what and to what. to paraphrase.