@jeesoon it's the same, you have to make sure you have a full tunnel in openvpn, or add the remote network to the openvpn server's local network.

@whisper88 enable Safe Search, Omada router must be DNS server for clients, you don't need DNS override or anything like that.

@Semut You can't configure a backup device, but it's a good idea to have a backup, put it on the shelf, if you need it then delete the old router from the controller, set basic settings on the new...

@O2o There is no definitive answer on how to set up a network, but you can find some information and FAQs that you can look at here. https://www.omadanetworks.com/en/

@O2o here is a guide you can look at https://community.tp-link.com/en/business/forum/topic/650256

@O2o Multiple is something called bridged vlan, it means that all vlan share the same ip network and that there is full blocking between vlan in the same bridge, bridged vlan can still communicate...