@netwerkman All Deco models are designed to be compatible, yet some pair better than others. Mixing Deco models from the X-series is generally fine. For instance, the X68 works well with the X50-POE....

@AlexS_in_SA By default, Satellite Deco prefers connection to Main Deco. TP-Link gets a lot of questions on that design decision, so they did create FAQ article: Why does the satellite Deco still...

@Aidy2020 I can't explain why are you getting worse speeds, especially why in Access Point mode. I have Deco mesh with M9 Plus, I went through ISP router replacement with no issues. Just connecting...

@l0bit0 You will need to relax your requirements: 1. Run Deco mesh in Access Point mode; or 2. Run Deco mesh in Router mode and treat Main Deco as your router (as you should), connect Home Assistant...

@Aidy2020 With M9 Plus and gigabit Internet link, expect WiFi speed on Main Deco to be up to 500-600Mbps if everything is right. M9 Plus is WiFi5. It can't deliver gigabit speeds, so you need to...

@AlexS_in_S Can you clarify how would you want to see them connected? Patio to Lounge or Lounge to Patio?