Question about Zyxel Multy X Mesh System - set of 2

In my opinion, this should work because an Acesspoint can normally also be connected via a Lan cable. Otherwise, if the wireless connection of one node to the other is poor, no connection could be established.
However, I have connected mine via Wlan. Excellent performance! Even in the farthest corners of the property and the house at least 150 mbits. I have an extremely complex infrastructure (home automation, pool control, etc.).
The nodes (set of 3) have a greater range than a conventional acess point, as they are not connected via WLAN!

Until I bought the mesh system, I had big problems with the wifi connection (connection interruptions, poor performance, etc...).

They have been in use for 4 months. I can really recommend the system.