In my setup I actually have pfSense running in a virtualized environment as my Internet gateway to FiOS. From there I have the Almond+ plugged in and running in AP mode.
The LCD complains that it has no connectivity to the Internet, yet I can still associate it to my account on securifi.com and it is still controllable without any issues.
Now if the data corruption issues can finally be fixed, I can start transitioning my devices over.
In the meantime, I do have an older Linksys router running TomatoUSB also in AP mode serving my wireless clients. I would think in a large environment requiring multiple routers for coverage, you would have one main Internet gateway as well as a wired backbone LAN running the length of your house/building/condo/whatever. You would then have APs coming off of the wired LAN wherever you need coverage with the same SSID but non-overlapping channels.