@HustiUK TP-Link Deco does not support OneMesh. See this document for more info: TP-Link Deco Mesh vs EasyMesh vs OneMesh vs Omada Mesh What's the Difference?

@DukeCaboom Deco M4 have gigabit Ethernet ports. They should be able to handle gigabit speeds, wired. Their WiFi speed will be about 500-600Mbps in ideal conditions. This is as much as WiFi5 can...

@Balaji817 Yes, this should work just fine.

@palcouk Epson WF-3820 description says it has Ethernet port. Try connecting Epson WF-3820 with Ethernet cable to one of available ports of Main or Satellite Deco, and see if you can configure it...

It was great idea to move this info in Deco app, but M9 Plus and M5 don't have it in Deco app.

@ConcernedUser I run Deco mesh with both M5 and M9 Plus. I tested them both. I can tell that M9 Plus is natural upgrade for M5. My Internet speed while I did own Deco went from 300Mbps to 500Mbps to...