Hello Charles
For mixed-niche or IM niche OTO downloads, the best place would be under "Website Repositories" under the Repositories heading. Otherwise, the best place would be under the specific Niche.
Here's the explanatory text associated with the "Website Repositories" topic:
In general, store websites under the relevant Niche topic rather than under here. See Notes under the Repositories topic for more guidance.
"Websites" here means complete websites, more-or- less ready for uploading and hosting, rather than templates for sites.
Such sites may be sales sites with an associated product, content sites....
You could always create an "OTO" subfolder under here if you wanted.
Regards
Alex