I have seen a couple of talks about testing Apps and suggestions for double licences to ensure production sites are secured.
This is how I walk around this.
I installed 2 Una on my licensed domain. One on root and the other on a subfolder inside the main site. The production domain e.g xyz.com and the stagging xyz.com/demo.
Ensure the UNA credentials on the main site are imputed on the DEMO settings. Any App licensed to run on the main site will also run on the Demo. This gives the opportunity to test before installing on production sites.
You only need to install the basic UNA Apps on the Demo to manage space. You may not also set the DEMO Cron Job to run every second.