@bdlp You can buy a set of 2 x E4's. All Deco E4 are same hardware. Each can be used as Main and as Satellite. Buy 2 node set, add each of two new Deco E4 as Satellite Deco to your Deco mesh.

@Stefancpt I think you've got wrong idea about Deco M5. It can be ceiling mounted and it can be wall mounted, with optional third party wall/ceiling mounts, but it is free standing by design. Just...

@DT50 Product description on HP web site says HP Officejet Pro 8610 has Ethernet port. I would recommend connecting printer to Main or Satellite Deco with Ethernet cable.

@Stefancpt With Deco mesh, Satellite Deco prefers to connect to Main Deco. Only when it absolutely can't, Satellite Deco will try connecting to another Satellite Deco. This is an automatic process....

@R5Ryder TP-Link Support now offers beta firmware 1.6 for M9 Plus, in addition to M5. They promised firmware with that feature for some other models of Deco, but ETA is not clear. I don't know what...

@dphuff Both options should work. For second option, if you have apps or devices that don't like double NAT, you'll find it quickly. From these two options, I would choose the first one: with Deco...