There is no ‘correct’ way to do this at the moment. I know Umbraco is working on the concept of reusable blocks, where you can create a block and reuse it multiple times, but at the moment, that is not finished.
We usually have this content structure
Website container
— Content
——Home ← The one has the culture and hostnames
———Page1
———Page2
——Shared content
———Faqs
———Locations
———…etc
——Settings
So effectively, only pages under ‘home’ have a routable URL. And when you have multiple sites, you simply have more containers:
Website container 1
— Content
——HomeWebsite1 ← The one has the culture and hostnames
———Page1
———Page2
——Shared content
———Faqs
———Locations
———…etc
——Settings
Website container 2
— Content
——HomeWebsite2 ← The one has the culture and hostnames
———Page1
———Page2
——Shared content
———Faqs
———Locations
———…etc
——Settings