Your size puts you in between two solutions.
You could consider using SAML. Ideally, combine this with something like Cisco Duo and a (Duo Access Gateway). I say "ideally" because this is an easy to administer system for you. It's worth the small extra cost for the saving in grief compared of using something like Azure AD IDP or ADFS.
https://documentation.meraki.com/zGeneral_Administration/Managing_Dashboard_Access/Configuring_SAML_...
If you think your staff numbers might grow - you should go with SAML now. The pain of doing it now will be less than the pain of doing it later.
The other option is to go with @BrandonS's suggestion. However, I would also enable MFA on that shared account. Basically save the QR code locally the first time you generate it, and then get every staff member to scan it into their favourite authenticator app.