FWIW I have a VBS file that uses calibredb to export files to a different folder (could be a NAS since it's one way) in a single flat folder
Code:
export --progress --all --dont-save-cover --dont-write-opf --format epub
--single-dir --template "{authors}-{series}{series_index:0>2s|[|]-}{title}"
--to-dir <<Destination>>