im using unifi now , but the router is downstair , because my pc located upstair at my room therefore signal very weak and unstable , game lag most the time . any solution ?

what in my mind is using this TP-Link 200Mbps Powerline LAN Homeplug (TL-PA211) and TP-Link 200Mbps Powerline LAN Homeplug with 300Mbps Wireless-N Extender (TL-WPA281)