@Ygal_Mizrachi 

Hi, the network layout would work perfectly/

Any Deco and TP-Link switches are capable of your network design and for more details, you could look at this link:

General questions about Ethernet Backhaul feature on your Deco

  @Heidi_Alp Thank you so much for taking the time to answer my question you have been most helpful.

I am still hoping for an "Official" answer from TP-link team. It's important that they answer because based on this answer my company will take certain commercial decisions. 

Again thank you so much for answering my question.

Ygal_Mizrachi wrote

... my company will take certain commercial decisions. 

  @Ygal_Mizrachi 

If you plan to deploy Deco mesh in commercial environment, consider the following:

1. You can configure and manage Deco mesh only through Deco app. There is no Web interface to manage Deco mesh.

2. You will need Internet access to manage Deco mesh. If your router disconnects from the Internet, you might not be able to manage Deco mesh until Internet connection is restored.

3. Deco mesh runs Internet health checks by sending DNS queries. If your router/firewall blocks all or some of them, Deco mesh might decide Internet is down.

4. There are very few options to configure in Deco mesh. In AP mode it is not a big deal, as network management stays with the router, but saying it so that you are aware.

5. Deco mesh can run two WiFi networks: Main and Guest. In Access Point mode they can be isolated from each other, providing necessary separation. Yet, any device connected to Deco unit Ethernet port automatically joins Main network. There is no configuration setting to disable Ethernet ports or to remap them to Guest network. If this is a concern (anyone with laptop can gain access to Deco Main network by just plugging laptop to Deco Ethernet port) - consider different WiFi mesh brand.

  @Alexandre. 

Thank you for your answer.

The Decos will not be deployed on a commercial environment.