EAP660 HD

Short answer just keep the 3 decos return the archer. The other option is to return the decos, and buy other easy mesh nodes to expand the archer easy mesh. It's really confusing the 3 different incomparable TP-Link lines As I understand it. Deco: simple, plug and play Easymesh: more features and control inter-brand compatibility. Omanda: more expensive, prosumer, allows and requires more configuration.

You need an wired backhaul wifi mesh system like omada or unifi. https://youtu.be/n34oT8mZetE?si=RTywTOV0BXaqUrxh

We went from a eero 6E to new TP-Link Omada stack. Eero worked surprisingly well for very basic, no config, home requirements. We need VLANs and VPN so made the switch and couldn’t be happier.

I have had both Unifi and Omada. You can't go wrong with either. I switched from Omada because Unifi had cheaper 2.5gb switches at the time. The Unifi controller is a little better than the Omada one.

If you're wiring, choose something better than consumer meshy stuff. I would second the UniFi recommendation, and TP-Link Omada is good also. Wire everything that *can* be wired and save the wifi for those things that can *only* use wifi. The UniFi Cloud Gateway Ultras as the router/controller and whatever switches you need, plus the APs of your choice U6+ or U7+ are good would be a great setup with fully unified management of the network and components.

In consumer world - Asus and TP-Link are the better choices. Eero is great hardware has a subscription model for some needed (IMO) features. I would avoid Netgear, D-Link and Linksys - they are not what they once were and have subscription models, sometimes poor support, and varying reliability and quality. You could also consider gl.Inet Flint devices if you're looking for an all-in-one router, they have gained a very good reputation. I agree that a better choice than any of the above would be Ubiquiti UniFi and TP-Link Omada is also decent - it's different than the consumer gear. Reliability is one of the major points of these prosumer setups. I've been running UniFi for 7 years, it's great.