This XML exists for compatibility with older Outlook clients and is required by the manifest schema.
As a best practice, since your add-in only uses add-in commands, set the minimum requirement set in the manifest to at least 1.3
, so the manifest and this URL won't be used by clients that don't support add-in commands.
<Requirements>
<Sets>
<Set Name="Mailbox" MinVersion="1.3" />
</Sets>
</Requirements>
Technically, this SourceLocation URL still appears in the payload of an identity token, so I would suggest setting it to a URL that's unique to your add-in.
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