Best practice wifi vlans and voip over RED interface

Hi everyone,

we created a BO and connected this site with the HO over a RED60 without VLAN tagging.  So far so good :-).  

Now we would like to enroll some AP's in the BO with a setup similar to the HO.  In the HO, we make use of Unifi HD nano AP's with a Unify Dream Machine Pro controller.  Authentication for the internal wifi is based on a Windows RADIUS server.

Can we use the same management vlan, internal wifi vlan and public vlan or should we create 3 new subnets for the BO? 

Same question about the VOIP vlan, what is the best approach to make use of this VLAN on the other site?  

We make use of a Windows DHCP Server on the HO do deliver dhcp requests.

Inter VLAN routing now happens on the Huawei L3 Core switch in our HO.

Can someone point me in the right direction how I can handle this?  

Thanks!