Re. gaming... my son is a semi-pro gamer who says that wifi is the work of satan. He will only ever game on an ethernet cable connection. If you can, run Cat6 cable from the Hub to the room and use that to feed all his devices.
That said, he uses a pair of high quality powerline adaptors for his connection. However they have some limitations for their use and also cost ~£90 - and for around that money you can get a decent introductory Mesh system (look at TP-Link Deco M4, for example).
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.