@Craig_A4 This setup is possible and should work. The only caveat is not every brand of powerline adapters is compatible with Deco mesh Ethernet backhaul. Worst case, you may also need to replace...

@KingKoen You have different network setup than I expected. This is what I expected: The scenario I described is applicable to this setup, and not to what you have. Sorry, out of ideas with what...

@KingKoen There must be networking switch connected to the second port of Main Deco, and Satellite Decos as well as other hardwired devices on your network pass Internet traffic through that switch...

@Adonio With second configuration, you'll get faster speeds on a computer than on first, could be about twice as fast. With everything connected via the Ethernet, you'll get best possible speeds for...

@Kuba123 No, it will not. To have consistent roaming without interruption you should disable WiFi on router.

Philbert wrote @Coups Yeah if your WAN is the slow bit, then really no need to go for the X range. AC WiFi is fine for up to 500mbps, once you pass that your WiFi will start to become the bottleneck...