Create a site collection or a team site

SharePoint allows installing add-ins on a site collection or on a team site.

Create a site collection for SigningHub add-in
A SharePoint Admin may use an existing site collection or create a new site collection in their SharePoint environment to install the SigningHub for SharePoint add-in on it. Once you are done with site collection, create SigningHub permission levels in the site collection.

OR

Create a team site for SigningHub add-in
A SharePoint Admin may use an existing team site or create a new team site in their SharePoint environment to install the SigningHub for SharePoint add-in on it. Once you are done with team site, create SigningHub permission levels in the team site.