I am looking to solve an issue in our house, which is that no matter where I place the 2 satellite X50's (I am limited to one location for the main one) the signal to our living room is always awful.  I assume this is down to it being in an extension and so with thick walls with insulation.

Before hacking open all my walls to add in ethernet ports which I really don't want to do, my last option is to add in a powerline P9 to the living room instead of the X50.  As I have disabled the router's wifi, how do I configure this?  Do I simply plug one P9 into the main deco X50 (plugged into the wall, not an extension cable) and one in the living room, or one into the router itself and one in the living room?

I did also check here - https://community.tp-link.com/en/smart-home/forum/topic/657324 so I know it shoudl be possible in theory, but just want to double check on the best way to do this.

Thanks!