HI J H,
Currently we have shared user function that can be used for landlord and third-party situation. You can register a main account for a device and add the third party as a manager.
Please let the shared user download the app and use his own email register an account with Netro first. Then you can add his email as a shared user in your account.
Please check this article https://netrohome.com/forum/posts/147
Thanks,
Wency
Netro Support