I'm trying to figure out possible ways to launch Mediawiki-Wikibase software to allow collaborative creation of wiki pages and corresponding knowledge graph.

As well as I understand, it is possible to configure a single installation of Mediawiki with Wikibase extension, and have all wiki pages in the Main namespace like https://example.org/wiki/ and all graph items in the namespace  https://example.org/wiki/Item:

I want to build something  more similar to Wikipedia-Wikidata -- wiki pages in the namespace https://wiki.example.org/wiki/ and wikibase graph in the namespace  https://graph.example.org/wiki/ . Am I right that I have to launch two instances of MediaWiki for that, one without Wikibase extension and one with it?

Or is there a simpler way to configure the system to get such namespace structure?

Thank you for help!
Victor Agroskin