^ This.
See
here for details. It is actually a wireless-based mesh solution (which admittedly won't have the absolute capacity of a mesh solution with wired access points, but will be perfectly adequate for home use) which means that any mobile devices you have will automatically and seamlessly move to use the access point with the best signal as you move around the house without worrying about different SSID's.
Ethernet over Power is often an OK solution (I used to use it), but some applications can have compatibility issues (such as the Sonos streaming speaker system - which is why I stopped using EoP) and it has the potential to drive local amateur radio enthusiasts mad as it can cause radio interference on some bands.
Personally, for the OP's purposes I would suggest adding one or more BT Complete WiFi discs to the Hub 2. Note that the older white BT WholeHome WiFi discs are not compatible with the Hub 2, so make sure you get the correct
Complete WiFi disc(s).