On the hub 3 I turned off the wireless and had it in router or modem mode (cant remember what it was called).Then using one of the Ethernet ports I had my network link connected to a Unifi Switch which then powered 3 Unifi AP's. I also used one of the other ports on the switch to provide a connection for another switch. This all worked fine.
Now with the Hub 5 if I do the same and put it in to modem mode, plug my 2 network cables into the Ethernet ports exactly how I did with the hub 3 neither of them work in the same way. Thats why modem mode isnt an option.
So I have the same setup now as before using the Hub as a router