@terziyski 

thank you for the reply, you were very clear.

So a possible scenario that i see is to buy 3 pieces, and the first one beeing installed near the router, doing that the router wifi will be disabled.

In this scenario a chain connection will work using both wifi and powerline?

Router + PX1 <-> PX2 <-> PX3 

Or 2 PX would be enough? For example eliminating the PX2 in the middle 

of the house...

  @AlexCoxie 

Hi, while TP-Link's Deco, Archer Router, and Omada EAP all support Mesh functionality individually, they are not designed to work together to form a single Mesh network. These product lines, although under the same brand (TP-Link), differ in their technology and software, preventing them from inter-operating in a unified Mesh network, you may still be able to use them together, but they won’t be able to form a single, unified Mesh network. In other term, if you use an Archer Router and a Deco system together, there won’t be any seamless roaming between the Router and the Deco system.

For more details, please refer to this article.

For your situation, you may also choose to use Deco mesh to replace the current router directly. For Deco PX50, the built-in mechanism will decide it work via Wireless Backhaul or Powerline Backhaul or both.

  @Marvin_S 

Thank you for your answer, i don't want to use WIRES so the only solution i see is to disable the AP on the router and buy 3 Deco PX-50 with powerline feature, the first Deco will be connected through the LAN to the Router (locally), and the other two will be located in the position specified in the diagram above. in this way i will have a mesh wireless from DECO using also the powerline.

Could this setup be a solution to me?