They don’t need to be close to the hub, I’m not sure what those people were talking about. The whole concept of zwave is a “mesh“ system where most mains power devices can pass along messages for other devices which are further away.
Read post 11 in the following thread, then go up to the top of the thread and read the whole thing, and you’ll understand how all this works. Click on the topic title of the following post and it will take you directly to post 11.
