My father recently fell and broke his hip. Currently, the only way for him to get to the toilet is walking up three stairs with only one grab bar. We need to install dual free standing railings to make it safer (ie: they will only be attached at the door frame, no walls on either side). Any thoughts as to why one type of railing is safer than another? Wood vs metal system? I’m leaning towards a metal system just for aesthetics but couldn’t find any safety info on railings in general.