It’s not fun working for a company that causes trouble installing productivity software…
You should actually sell the company of using Obsidian as a standalone tool. If it’s web based all the traffic goes through an outside company network node and that one could look at all the data, so a disk based system most likely will required and a network based solution will be blocked by security sensitive companies. If I was the CTO for such a company I would block any network-related productivity tools myself.