I know I spent 20 years supplying them and fitting them for Charities and Social Services.
Whatever you do do not get a chrome or stainless steel rail, because once your hands are wet and possibly soapy. You could end up falling backwards into the bath. Worse still dont even dream of a suction type rail.
SS asked me to go and see what I could do after someone had an accident. After having seen a ladies injuries who had fallen because of a grab rail pulling free. From that day onward I refused to fit any other style of bath grab rail other than this one ..
Amazon.com User Recommendation
If I said I'd fitted hundreds of these I would be lying .. it's a lot more than that. You could tie your horse onto one of these when they are properly fitted !