[scratches head] Did this person tie their ankles and their neck to the same point? Or what?
With determination, you can lean into it.
Even in well thought out isolation cells that have solid doors instead of bars, a toilet/sink combo that relies on pushbuttons instead of handles/levers, and lighting fixtures and sprinkler heads designed to break away at something just just barely above a slight breeze, there are places you can hook a rope to.
Or, as you might have unknowingly suggested, hogtieing oneself can be a (pardon the pun) viable option.
Constant video monitoring only helps if someone actually watches the video. 5-minute suicide checks are about three minutes too long, considering how long it will take to assemble the staff necesssary to go into the cell.
stay safe.