So that your Betta gets a "bed" close to the water surface....
Our bunk bed with strong suction cup can be mounted on any smooth surface. Our Bettas love to chill near the surface of the water as they can breathe easily from there.
Tip: You can get your fighting table used to the sleeping place by attaching it approx. 2-3cm below the water surface and placing the food right there for the following days. He learns very quickly that he can rest undisturbed here and will visit the place more and more often.
It is best to choose a place on the rear pane. In front, on the platter so to speak, it is often not quiet enough to be able to really relax.