It should be screwed into the ceiling because its pretty flimsy.  Its also very awkward for the cats to get down. It needs to be beside a cat condo so they have something to jump onto. I bought 2 of them at the same time and Im glad I have the condos beside them because there is no way of getting down . It would also benefit cats if it were carpet rather than very thin material.  They cant get a grip on that cheap material.