WiFi Extender Plug into Ethernet: Where and How

Yes, if the model supports access point mode or another wired input arrangement. Connect it to a LAN port on the router and follow setup instructions.

For wireless setup, plug it into a socket between router and weak-signal area, where it still receives a good signal. Avoid the dead zone itself.

Some extenders support access point mode using an Ethernet cable from the router. Check the manufacturer guide because port functions differ.

Usually pairing or configuration is still needed, even if simple. Follow the included setup guide and secure the network as directed.