2 accounts one address

I have a rental unit that I have a one year internet only agreement with XF that I use strictly for monitoring a smart water turn off system to prevent water damage from leaks.    I've used it for short term rentals, so I didn't mind just paying the internet only for that.  However, now I am going to rent it long term, and my tenant will need her own internet /tv package.  I've been told I can't have 2 modems and 2 accounts at the same address.  I seriously need to find a workaround for this, as I need to continue to monitor my water system, and my tenant needs her own account at this property. I have a one year contract with XF, that I obviously can't cancel without penalty, and in any event, I don't want to ask the tenant to give me her password so I can hook up these smart devices through her internet.  There has to be a way.  Please provide some workaround for this, I don't understand why there can't be 2 separate accounts for two different people, at one address?  And to add to the issue:  my tenant has her own XF internet/tv account already, at her current address, and she also has a contract which she can't cancel without a penalty, which she wants to transfer that service to my rental, of course.  Help!