@David-TP Ah, great. Thank you. I thought it must be possible. Thanks for the links which provide a full explanation.

@ARGamingPK1 ARGamingPK1 wrote @cdsatp Main Deco connect with ISP's router by ethernet cable to get the internet connection from the ISP router and turn off the WiFi of your ISP router to access...

A basic question: does the first Deco connect to my ISP's router, or does it replace the routert? If it connects to the router, will devices connected to the mesh network be on a different network...