As you have remote and on-site employees, we recommend doing both. In December 2020, the Department of Labor issued Field Assistance Bulletin 2020-07, which permits businesses to share the poster information electronically as a supplement to the requirement to post hard copies. Electronic posting is only allowed as a substitute for physical posters if the following conditions are met:
Note that electronic posting of required labor posters must be as effective as on-site posting. They should be readily accessible without employees needing to ask for permission to view them or where to find them. We recommend sharing in a location where remote employees typically receive other legal notices and important information from your organization.
This Q&A does not constitute legal advice and does not address state or local law.