No, you will need to connect the INPLUG to the 2.4GHz connection. Most routers that have a 5GHz connection also have a 2.4GHz connection running side by side.
The INPLUG will only operate on 2.4GHz networks. Routers with a 5GHz connection will also have a 2.4GHz connection please check you router instructions to ensure they operate separately and do not use the same SSID (network name).