The requirement for an RN 24/7 appears to be unnecessary; however, having 24/7 accessibility to an RN or NP to provide supervision to LPN staff or respond on site as needed would seem reasonable.  Otherwise, if an on-site RN is required 24/7, there is no need for LPN staff on site.   Earlier draft regulations did not appear to require 24/7 RN staffing (August 2021).