The SH3 in router mode is useless for Gaming, and then if you add WIFI.
I have an SH4 in modem Mode, with my own router. I never drop connections when online Gaming. My PS4 and PC are both Wired.
My own router controls all port forwarding with uPNP, and always on NAT2,
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Red (VM SH2 AC Beta tester)
Running on 1Gbps VM service with SH4 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech.
My advice is at your own risk. If you are happy with my answers please press Kudo ?