Can I install NewHub on a multi-node Qlik Sense environment?
Yes, it is possible. You do not need any extra licenses while using a multi-node site with the same Qlik Sense license.
Once you install NewHub, for each node, you will see all the apps that corresponds to that environment.
If you have multi-node and different licenses, you'll need a new installation for each license, since it's a different Qlik Sense OnPremise installation.