I'd advise to refrain from creating a separate scoring setup for each BU unless it's absolutely necessary, as the extra effort of creating and maintaining separate scoring models wouldn't be worth it (as you said). If you could explain the issue that you're facing w.r.t. Job Role/Verticals in a bit of detail, then we can help with our suggestions/thoughts on how to best accommodate it in your global scoring model itself. But overall, given that your organization shares process/sales agents/workspace for all the BUs, it appears that you should be better off with a single scoring model instead of breaking it out into individual ones for each BU.