Is it legal to have just two LPN's on a MedSurg floor at night

Is it legal to have just two LPN's on a MedSurg floor at night with the idea that you could use your telly monitor if an rRN or your house supervisor ,who's an RN .  Is it legal to tie them up like that, pulling an RN away from  telemetry monitoring..  Or depending on house supervisor to do the initial assessments, pushing all the IVP meds, and any blood product. Round in all areas one to two hours and if there's an area, that's busy stay and help them until things settle back down. supervisor has to be at all. Baby births and all codes. Seems like you're over, extending the house supervisor and expecting the telly person to just walk away from the telemetry sounds a little much to be responsible for. I'm just wondering about the safe practice. Of  2 LPN's  on med surge floor at night