I have a connection coming into the house, then into a Synology router. I have 2 VLANS set up, the default one and a 2nd one called Secure. I don't have Ethernet run in my house but we have 6 coax ...
Playing online games over WiFi is generally a terrible idea anyway, because the latency is so variable. Buffering works well for streaming and slower paced gaming is not really so latency sensistive, ...