@Maem 

Hi

Is the other floor the same circuit as the room where the router is located?
If so, you could consider connecting the TL-PA7017P to the router using a wired connection, then pair it with the TL-WPA7817 placed on the other floor.

Considering that some devices on the same floor as the router also experience weak signals, it might be advisable to procure one TL-PA7017P and two TL-WPA7817 units. Once paired, position one TL-WPA7817 on the different floor and the other on the same floor where the signal strength is low.

  Hi @Joseph-TP ,

Thank you for your answer.

Normaly everything should be on the same circute.

I've done some tests with an old CPL I have, they are 500Mb CPLs. When I'm next to the rooter (which emits at 500mbps) I'm down to 40Mbps going through the CPL. 

Will newer CPLs have better performance ? (If I'm not plunging the old ones at the same time of course)

Can a setup like this work ? Plug the TL-WPA7817 base next to my rooter on the second floor, pair it with the TL-WPA7817 wifi emeter on the first and then pair a single (not in kit) TL-PA7017P in a room of the second floor ?