Man, them Ikea ones seem kinda expensive. You would need two, or just one??
I got an idea. Have you ever seen a shower curtain rod, the adjustable kind that is spring loaded?? That would work pretty good, but I think they are only about 4-5 feet long. So, we gotta extend it while retaining that spring-loaded adjustability.
Use one of those shower rods, and find a piece op pipe (metal or PVC) that the shower rod JUST barely slides into (for a nice tight fit). Drill one hole in the shower curtain rod, and several holes in the pipe. Now, you can slide the shower rod into the pipe, and put a pin through it when you get to an acceptable height, Let the spring loaded mechanism take up the slack, and voila!!
Take a look at my Paint skills:

They got rubber feet on both ends to protect the walls in your shower. The rubber feet are now protecting your floor and ceiling!
Get it?
Whaddya think?
FJ