Hi!
For a large indoor installation, you might want to consider creating multiple private VPS locations to ensure accurate localization and avoid potential issues.
Private VPS locations don’t require approval, which makes them ideal for your scenario. Public locations, on the other hand, must meet specific criteria, and their approval process can take 1–3 business days depending on how closely they meet the requirements.
To create your scans, you’ll need to use Scaniverse—this is the designated app now that Wayfarer has been deprecated. For more details, check out this thread: Important Update: Niantic Wayfarer App Deprecation on Android.
Unfortunately, there isn’t a way to create private or test locations without a Pro license. If you want to test your content beforehand, you could use an existing public VPS location nearby.
Your intended workflow—developing with a placeholder scan and later uploading a private scan for deployment—sounds feasible and aligns well with VPS capabilities. Good luck with your project!