You could try a desktop extender instead of the plugin type I never had much luck with the plugin where you needed to set up new wireless networks. The newer mesh type use your existing SSID.
https://www.amazon.com/NETGEAR-Wi-Fi-Range-Extender-EX7000/dp/B00R92CLD6?ref_=ast_sto_dp
https://www.amazon.com/NETGEAR-Wi-Fi-Range-Extender-EX7000/dp/B00R92CLD6?ref_=ast_sto_dp