@Calinux Start with this FAQ: General Questions about the Powerline or PLC Backhaul Feature of Deco As for Deco M4, it is known issue for Satellite Deco to prefer to connect to Main Deco, even if...

@Hagarno55 If you considering something lesser for the barn, consider Deco M5. It is same family as M9 Plus, you will not lose Deco mesh settings and functions by adding M5. TP-Link sells Deco M5 in...

@Cali2 I'll try to answer your questions: >1. Will I encounter any problems with my mesh if I combine Wifi 6 and Wifi 5 Deco models Most likely not. Some WiFi 6 capable device might not want to roam...

@Hagarno55 There is no benefit of having different model for Main Deco. Deco M9 Plus is capable WiFi 5 device that can deliver WiFi speeds much faster than your Internet speed. I have two M9 Plus at...

@Simonmillett Yes, you can add more units. As you have Deco M5 2-pack, it makes sense to add more M5s (and not different Deco model). Deco M5 are sold as single units, 2-pack sets and 3-pack sets. It...

@JasonGreer >The layout is around ISP---Router---Main deco M5---Deco M5---Deco M5 I am assuming Satellite Decos are wirelessly connected, not through Ethernet cable. On Main Deco M5, you should be...