Good morning, 
I am writing to ask the more experienced users for a suggestion. 

I have a house on 2 levels. 
On the ground floor I have the wifi modem and router, model: ‘zyxel home and life hub’ provided by the ISP WindTre.
The zyxel then creates the wifi network configured inside, which we will call ‘Wifi Ground Floor’.

I wired a LAN network point from the zyexel modem router on the ground floor to the first floor.

To the LAN network point on the first floor I have connected by cable the "TP-Link Deco X20" which is then connected to one of the Lan ports of the Zyxel .

With the ‘TP-Link Deco X20’ I can create a new wifi network e.g. ‘Wifi second floor’ but I cannot make it mesh the ‘Wifi ground floor’ network generated by the Zyxel wifi router modem.

Do you think this is possible?

Thanks in advance to anyone who would like to help me

F