As far as I know, it's still possible. At least on the XBox side. I have two XBox One consoles on my network and I use different ports for each (you can specify the port in the network settings). I ...
I bought a Mikrotik CRS109-8G about 18 months ago, for use as router and AP in front of my Virgin Media cable modem (which is actually a combined modem / router / WAP with the modem-only mode ...