I think he is referring to joining a secondary controller to the Z-Wave network of the first, but then splitting devices between them. That is not what you're doing if you have Ring on its own Z-Wave network and HE on it's own. I and many of us here have a Ring hub and HE Z-Wave running in parallel (I actually have three HE Z-Wave networks running independently and the Ring Z-Wave network running independently), with no problem.
This fantastic community app/driver will integrate your Ring hub into your HE via the LAN and that will allow you to use your Ring sensors and the keypad with HE too. You can even trigger the Ring alarm via HE if you wish.
