In a typical corporate environment, All desktops are centrally managed by the IT team. User's do not have the ability to install anything.
If SAS is installed on the Desktops, then the IT team only needs access to the software. Depot can be stored along with other software installers.
If SAS is installed on the Server, only the Admins need access to the software. Again this can be stored along with other installers.
Therefore SAS depot can be placed along with other software installer packages.