Deco X10

I've got a Deco X10 and two M9 Plus covering three floors of a house. Works great for me. They're decently powered devices, each running about 8-10 WiFi clients including two TVs streaming simultaneously.

I have bought the x10 recently and they work great under similar conditions although we only have 125mbps

It would work, if you needed to change media types that the Deco doesn't natively handle, like MOCA to Ethernet. Your primary X10 would be in router mode, and your remaining devices would be AP slaves. Your router would handle DNS resolution and DHCP address distribution. If you can connect the AP's to the router physically, you'll have ethernet backhaul, which is ideal. Otherwise, if your mobile devices handle multi-AP handoff, it will use the strongest signal for the heaviest data loads, and defer other tasks to background channels on the other AP.

I have the same models, thoroughly recommend too

Plus one here for Deco. I have four WiFi 6 models. Mesh is a better solution I agree. WiFi 7 models are still very expensive but few devices are compatible at the moment so for me WiFi 6 is the best option for the money.

If the system you are purchasing has Ethernet ports on the mesh nodes, then you should be fine. My old Google wifi system I just replaced had this and it worked great. That TP-Link system appears to have the same functionality. I would go for mesh over a network extender, as mesh is designed to allow devices to roam between the nodes, a network extender usually is not meant for that.

You're dealing with bad mesh systems. I looked up that Deco X10 and it has the normal router 2 radio thing, one for 2.4ghz devices and one for 5ghz devices. When the mesh devices need to talk to each other they're using those same radios to communicate. This is the same way as an extender works, listening for a faint signal from the router and shouting it to your device. These solutions clog the airspace and kill bandwidth. What you want is a tri-band mesh system - 2.4/5 radios for your devices, and then a third radio for communication within the mesh system. If you like TP Link, look at the BE65, there's a 6ghz radio for the mesh system so your devices don't have to share bandwidth.

If you are using AT&T extenders then that is your problem. I bought my own DECO Mesh system and shut off the AT&T wireless function and use my DECO for my wireless connections and my internet works great and all my devices connect with no problem. I couldn't use my printer if the extenders were connected and now I never have a problem. [DECO I bought.](https://www.walmart.com/ip/TP-Link-Wi-Fi-6-Mesh-Router-Replacement-System-3-AX1500-Routers-Coverage-5-600-Sq-ft-Parental-Controls-Connect-120-devices-Deco-W4500/2932481773?wmlspartner=wlpa&selectedSellerId=0&wl13=5842&gclsrc=aw.ds&adid=222222222772932481773_117755028669_12420145346&wl0=&wl1=g&wl2=c&wl3=501107745824&wl4=pla-394283752452&wl5=9016917&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=local&wl12=2932481773&veh=sem_LIA&gclsrc=aw.ds&gad_source=4&gad_campaignid=12420145346&gbraid=0AAAAADmfBIoHhfLrBWgn9hxdw2g64jnqW)