I am having them installed by a third party and I will not be present at the home when they install. Once they install how can I connect to my app immediately without being at the location they have been installed?
They’d have to use their phone to setup your account and link the devices to it. Setup requires a phone. Then if you trust them that is. Then you could just log in to the account. But you’d also need access to the 2 factor authentication as well.
Once you’re in you could change the password and log out all others in the app. Still, it’s a risk unless you trust them completely.