We have one of these in each room (so we don't have to remember where it is when we need it) -- got one for MIL years ago and got these before I had my knee surgery:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1. When I was in rehab I had my DD bring one to me and the occupational therapist said this was the best one she had seen (id does not fold and does not have suction cups but it is very stable and works very well.
I also have this:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1. I can use it to open the bottom dresser doors and to hang coat hangers on my shower rod when I dry my shirts. I also use it to take off my pants or socks if I am in pain.