CPTUI handles parameters available for the
register_taxonomy functions, and as far as I’ve ever seen, there’s no parameter for metabox placement. The menu position fields control the order and placement on the left hand side of the admin menu, but nothing regarding metaboxes.
I know all the metaboxes are able to be re-ordered and drag-n-drop style moved, but that’s going to be a per-user detail, and not really something you can programmatically set, as far as I’m aware.
Wish I could help you more.
It’s helpful to know that there isn’t really a way to do this. The standard position will be fine, as the users are accustomed to scrolling down to add featured images anyway.
Thanks so much for your weekend response!!