Hi For powerline device, only one need connect to your modem router, Hub 5.

The other one should plug into another room to extender the network. If you connect two into the Hub 5, it will establish a circle, which will destroy the network.

Watch the setup video for some help.

https://www.tp-link.com/en/download/TL-PA9020-KIT.html#video

Hello Anton, many thanks for the reply

ok so the Powerline next to the router only needs 1 Ethernet cable plugged in to the router

in the other room, 2 devices can plug into the Powerline by Ethernet 

is is this correct?

thanks

john

This is correct

Thanks very much guys, for me this was not clear in the instructions, the faq or the videos 

case resolved

thanks again