I've just bought a TP-Link WPA4220 Kit, as I'm trying to strength my wifi near to my home electric car charging point.

I already have a TP-Link powerline kit (AV500) which transports wifi to its paired extender in an outhouse in my garden.

I'm therefore trying to get this new WPA4220 extender to strength the Wifi within my house, however i am struggling to get it to connect to my existing old TP-Link powerline adapter.

I've been told you can run two extenders off the one adapter, is that correct? If so, how do I do this? I've struggled to do this so far so any help will be greatly received.

Thank you.