Hi there, Beefyhill-1.
Sorry for my late response. Thank you for all of your patience while waiting for a reply. I just wanted to make sure that your issue is addressed. Yes, you would need to have two subscriptions for two separate Home/structures. One Nest Aware subscription per home/structure is how it works. If you own multiple homes with Nest/Google products in them, you would need a separate subscription for each home.