Amazon has decent shower chairs for about 60 bucks. I just buy one and send it to the hotel then leave it there. It’s probably cheaper than a rental.

I am a para so don’t know if this would work for you but here is a link to what I have used

Medline Tub Transfer Bench, for Use as A Shower Bench or Bath Seat, Light Blue https://www.amazon.com/dp/B00AIMT4CA