Co-Authoring an Excel Document

Evening Everyone

I'm trying to share an excel document (does have lots of formulas, a few macros, and every sheet it protected) and what I want is either to host in one-drive or shared drive and share between about 20 staff. I need them all to be able to open it at the same time.

We currently use sharing and it doesnt work too good - lots of locking going on and corrupting the document.