Install SigningHub for SharePoint on your app catalog site
When using an on-premises deployment of SharePoint, SigningHub gives you an exciting option to install the SigningHub for SharePoint add-in on your app catalog site and deploy it on other site collections from there. In this way multiple site collections within the same SharePoint deployment can use the same configurations of SigningHub for SharePoint (as installed on app catalog site) instead of installing the add-in on each site collection separately. In other words a single SigningHub integration will be used for different site collections.
A SharePoint Admin may use an existing app catalog site or create a custom app catalog site in their on-premises SharePoint environment to install SigningHub for SharePoint on it.