Thank you for both the info and clarification, Dara!
As I try to sign up at IPTV66, it is saying my MAC address is invalid and should start with 00:1A:78 (which I should have anticipated, based on what I have read) which neither my Wi-Fi or Ethernet MAC address does. Can I/should I change my MAC address somewhere? If so, should I within Kodi, or (for that matter, is it advisable I run it not on Kodi but on some other software I can download for my M8S Android box?) somewhere else? Or, as entering the MAC Address is optional at this point, should I skip this part in signup?
And I apologize, this seems like the kind of question you've likely answered 100 times before, but my google-fu is failing me.