Box Reflections numeric input : How to arrive at correct settings

Hi Everyone,
Is there a document that shows how the Box reflections location settings work, any tricks for quickly making sure your interior cubemaps line up. right now it’s a bit of guess work and I’d like to speed it up if there is a document or tips anyone can point me too.

This is what exists now, but it doesn’t explain how the numbers work in relation to a model. It’s awesome, wondering how to make it accurate on my end. Right now I am typing in a bunch of numbers and guessing

This is the document I was pointed to in another thread, but it doesn’t explain the input methodology.