Too bad one needs a minimum 1000+ units to use the ZoneFlex 7321-U (which uses a 3G/4G dongle as the WAN). That would be the easiest thing.
Perhaps a Cisco RV cheapo router, using the USB port to plug in a USB modem?
Your choice of ZF AP will plug in to the router LAN, then serve your office.
I would:
1. Identify which 3G,4G, LTE connections are available, fastest, and consistent from inside your office's "network closet".
2. Once you have your provider selected,, verify if you can get a USB modem dongle that will work at the highest speed possible from this list:
https://supportforums.cisco.com/docs/...
3. Buy the modem, buy the router, get the modem activated (usually this means its SIM card) and configured with your router and test.
4. Configure router and AP and test.
Caveat: If 3G/4G is too slow or unstable, perhaps getting a bonded 4G router (from Peplink). Disable their weak wi-fi and install a far superior ZF.
OR, perhaps one of the carriers that are serving your area HAS a relationship with Ruckus already and actually have a 7321-U for, uh, testing? Long shot, for sure, but it might be!