@NeilPayne 

Hi，welcome to our community.

May I confirm that you want to move the current AV1000 to your veranda(about 2 feet from the router albeit on the other side of an exterior wall), and purchase another AV1000 to put into your garage?

And your current AV1000 is a powerline kit, right? You may share the exact model on their back label, referring to the official website.

If so, as there is a powerline adapter that is connected to your router already, you can pair a new powerline extender directly with the powerline adapter and relocate it in your garage. It is not necessary to connect the new powerline extender to your original powerline extender(AV1000) via an Ethernet cable. But all the powerline units needs to work under the same power circuit and the power breakers may influence the performance.(The actual powerline length can not exceed 300 meters.)

  @NeilPayne 

Hi, thanks for your further sharing~

I am afraid 60-meter Ethernet cable is too long to connect powerline extender in your veranda to the AP in your garage, which will greatly influence the performance of AP.