We got the suction hooks at the dollar store that you put on the wall and then rotate the hook part downward to create the suction. I've seen them at Dollar General store 6 for $1.00.
We put one on the wall over the commode in our sideways Cat 11 to hang the shoe holder on so the stuff was right by the sink. We put lots of stuff (shampoo, contact solution, suntan lotion, hair mousse , medicines, hair brushes, etc) in the shoe holder so the small "vanity" shelf wouldn't be so cluttered.
We also put one hook on the full length mirror in the room to hang our lanyards for KTTW cards on so they wouldn't get buried on the table. Another hook high on the mirror for DH to hang his baseball cap on.
I used a couple on the wall of the shower to hang bathing suits so they wouldn't be in the way when I was taking a shower. I used the clothesline in the shower over night when no one would be using the shower. Bring several clothespins so you won't have to double over your stuff and it will dry faster.