@DecoNoob 

Deco mesh will always run its own WiFi network, it will not extend Netgear router WiFi. You can run both with same SSID, but it will be like running two separate WiFi routers broadcasting same SSID. 

Usually, it is recommended to turn off WiFi on a router after Deco deployment.

To deploy Deco in Access Point mode, setup first Deco and it'll become Main Deco. By default, it'll run in Router mode. Change that mode to Access Point mode. See How to set up Deco to work in Access Point mode

Then, add your remaining Deco nodes to the Deco mesh. They will run in Access Point mode, too.

  @Alexandre. Thank you for the quick reply! So just to make sure I got it - connecting it this way (3xAPs) will create 2 wifi networks with the same SSID. It will not mesh between the 2 diffrent networks (this is the main dissadvantage right?). Will it mesh internally in the second netwrok, between the 3 APs? Any other missadvantage of this method that I should care about? Thank you! 

  @DecoNoob 

When you configure Main Deco, it'll ask you to define SSID. You can use same SSID as on Netgear router, and you will end with two different WiFi systems broadcasting same SSID. You can also set Deco mesh with different SSID, and then you'll have two distinct WiFi networks at your house.

The point of Deco is to create WiFi mesh, so of course it'll work as a mesh among all three X60 nodes.

It depends on your home network and requirements, how you would want to utilize your Netgear router. Examples:

1. Turn off Netgear WiFi. If three Deco X60 is not enough for a whole house converage, get 4th X60, attach it with short Ethernet cable to Netgear router. Your house will be covered by Deco WiFi mesh only.

2. Run Netgear and Deco with same SSID. Depending on signal strength and location of device, mobile device may connect to either Netgear or Deco node. It may reconnect between them, but with brief WiFi interruption (these are two different networks). 

3. Run Netgear and Deco with different SSID. If you have stationary devices near Netgear router, such as Smart TV, connect them to Netgear SSID. If Smart TV only knows Netgear SSID, it'll never try to reconnect to Deco mesh, interrupting broadcast in the process. 

Connect devices that move around the house (tablets, smartphones) to Deco SSID only.

  @Alexandre. Thank you again for the detaild explanation and suggestions. My last concern regarding to this matter - Can I somehow (maybe even an hack) connect the main X60 wirelessly? I'm afraid it has to be connected with a wire by defualt, but possibly there's an hack for that.. I'm pointing to use it as AP. 

  @DecoNoob 

To use Deco mesh, Main Deco must be wired with Ethernet cable to your home network. In Access Point mode, Main Deco does not have to be wired directly to the router. It can be connected to any available Ethernet port/cable at your place, as long as it is part of your home network managed by the router. 

If that does not work for you, you may wish to look for a different brand of WiFi mesh.

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Exotic workarounds.

1. Someone connected Main Deco to router through the pair of powerline adapters. It did work, but that person was not happy with stability and speed of that solution.

2. If you have TV cable with one end near router and another end of TV cable is where you want to place Deco node, you can try linking them with the pair of MoCa adapters (Ethernet over TV coaxial cable).

3. Get standard WiFi range extender, with Ethernet port. Link range extender to your Netgear router, attach Main Deco by Ethernet cable to range extender. In theory, that should work. Could be even worse that powerline adapters, but covering all bases here.

  @Alexandre. Great exotic ideas! and thank you for all the help. In the end I found that the TP-Link perform much better and I'm now using the Deco only, and it working perfect! Selling my Netgear equipment. It's amazing how the Netgear price is much higher but the TP-link preforms much better. 

Tnx for everything!