I used the smallest gold colored screw in cup hooks. They weren't very noticeable or in the way for us. They stuck out about 3/8ths of an inch. In the 6X12 my shower area was in front of the door and had no interior walls. I had two hooks on the front wall ceiling, one just to the side of the door, and one out in the room close to the vent molding. When not in use the curtain just hung along the front wall behind my bench. There was also a porta pottie under the Black Ikea box under the bench. The curtain just stretched out and around for using it at night etc.
When it was stretched out it looked about like this from the inside. This is from my current CT that is 7X16, but the inside of the shower was about the same size.
My current shower is more enclosed and will have two walls of FRP and two that the curtain stretches across. I am still using cup hooks and an elastic cord on the curtain, but the hooks are up high on the walls instead of in the ceiling.
You can see the curtain folded back against two walls in this construction picture.
I have been using the 7X16 CT for two summers now and still don't have the shower area finished. I need to finish the walls and get two sheets of FRP up.
Hopefully sometime this fall if things slow down a bit.