If you think that Intel has small office PCs in its portfolio with its NUC series, you should take a closer look at the mini PCs from Newsmay Technology. The AC6-M model offers a full-fledged office PC in a miniature format with a footprint of only 63 x 63 millimeters and a height of 58 millimeters.
https://www.notebookcheck.net/Newsmay-Technology-s-AC6-M-mini-PC-in-review-A-full-fledged-mini-PC-for-the-office.555200.0.html