Yes, you can! You'll just need to sign in first (top right corner on the store page). If you're not already on Annual Pro plan, you will need to upgrade before proceeding with the purchase. You will then be able to get a free sensor for each new home you add (5 maximum).
Minut plans are billed per home. A home is an individual property or living space that a guest can book (whether it's an apartment, tree house or hotel room.) For example, an apartment that a guest would rent constitutes a home, a residential home constitutes a home, and a multi-tenant building or hotel where each apartment or room is rented by different guests constitutes multiple homes.
Yes, you can upgrade, downgrade or cancel your plan at any time. When you cancel or downgrade, the change will come into effect at the end of your current subscription period. So, for example, if you’re on Pro Annual, and switch to Standard Annual, the downgrade will take effect when your year of Pro subscription ends. Read more here.