@Alexandre. Thanks

That's  a great page. I will be setting my first Deco, as I say in AP mode so wiring the second through a switch is handy. It says set them up as WiFi first before wiring them up which is interesting

  @topgazza1 

 

Configure Main Deco. Bring your Satellite Decos for setup to the same room where Main Deco is, so that they have good WiFi link to each other. After Satellite Decos successful setup, switch Deco mesh to AP mode: How to set up Deco to work in Access Point mode

After that, take Satellite Decos to their permanent places and connect them with Ethernet cable to your home network.

TP Link manage yet again to make installation simple and common sense. Thank you for the advice Alexandre