My understanding is THAT you have "one" ZD in a central location and got AP's in different location. You want the AP's to be managed by ZD in central location.
If above is what you are looking at then i must state that it is a common deployment scenario and very easy to do.
How we do it:
run the command in AP CLI - set director ip (x.x.x.x) where x.x.x.x is the Ip address of the Zone Director and after applying this command, reboot the AP.
Above command is used by AP when it needs to cross L3 boundaries, as long there is a route between ZD and AP. this should work.
Please make sure on both sides router/firewall you have LWAPP port numbers 12222 and 12223 open.
Refer to below doc for more on this from PDF page 23 - https://support.ruckuswireless.com/do...