In order to accomodate varied size and position of image captured by camera scanning, use the new object mask feature in Lightroom Classic to select the individual image then have a crop-straighten feature to crop out the over scan. Adding a crop feature to the Mask options?
This would enable a preset to be made to batch crop multiple size image/camera scans. Wow.
Good luck and many thanks on all the incredible new features. Sincerely, Evelyn