Advice needed to extend system

Hi,
I currently have a mesh system set up using the Deco X60 AX5400 model. I have 3 units dotted around the house and seems to be working ok.
I want to extend the range out to my summerhouse and looking for best way to do this.
Excuse the basic diagram. I have 1 deco unit downstairs, near router. Then one unit almost above it in the upstairs landing.
I added a 3rd unit to the front bedroom so my son could connect his PS5 by wired connection.
The summerhouse is at the rear where I want to extend the range out to.
What would be the best option? Adding an additional unit or trying a powerline adapter maybe?
Thanks for any advice.
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I would suggest doing it the following way:
Take one of Satellite Deco and bring it to Summerhouse. Power it on there and see if it can establish link to Deco mesh in the house and if connection is stable. If it is, that means you can just buy additional unit.
In case Deco in Summerhouse can't connect to Deco mesh in the house, or it drops and reestablishes connection: that would mean the distance is too long. You will need powerline adapters.
If you need powerline adapters, I suggest you get pair of TP-Link brand basic adapters without WiFi, such as TL-PA7017P KIT (or similar TL-PA7017 KIT). Powerine adapter in the house must be connected to either Main or Satellite Deco. After adapters establish link with each other and it is stable, take one of Satellite Deco (not the one connected to powerline adapter) and bring it to Summerhouse. Connect that Deco unit to powerline adapter in Summerhouse. It should join Deco mesh, because TP-Link powerline adapters support Deco Ethernet backhaul.
After you verified that Satellite Deco in Summerhouse has stable connection to Deco mesh in the house, buy additional Deco unit.
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I would suggest doing it the following way:
Take one of Satellite Deco and bring it to Summerhouse. Power it on there and see if it can establish link to Deco mesh in the house and if connection is stable. If it is, that means you can just buy additional unit.
In case Deco in Summerhouse can't connect to Deco mesh in the house, or it drops and reestablishes connection: that would mean the distance is too long. You will need powerline adapters.
If you need powerline adapters, I suggest you get pair of TP-Link brand basic adapters without WiFi, such as TL-PA7017P KIT (or similar TL-PA7017 KIT). Powerine adapter in the house must be connected to either Main or Satellite Deco. After adapters establish link with each other and it is stable, take one of Satellite Deco (not the one connected to powerline adapter) and bring it to Summerhouse. Connect that Deco unit to powerline adapter in Summerhouse. It should join Deco mesh, because TP-Link powerline adapters support Deco Ethernet backhaul.
After you verified that Satellite Deco in Summerhouse has stable connection to Deco mesh in the house, buy additional Deco unit.
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If you will have to use powerline adapters, AX3000 in the Summerhouse should do just fine.
If you find you don't need powerline adapters, after doing test I suggested, arrange your Deco mesh in such a way that AX5400 in the Summerhouse connects to one of AX5400 in the house, and use new AX3000 as Satellite Deco in the house.
So, in both cases: yes, AX3000 should be fine, but make sure you get it from place with return ploicy just in case I am wrong.
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@Alexandre. Thank you :)
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