It depends on how you want to attach the upper part of the vortex to the ring. Neither of the two has an opening. I used a hook that was screwed into a beam.
As for the rope, it was actually too long in my first flat. The chair went super low.
I hope I was able to help you a little.

Good morning! We hung the swing from a solid hook screwed to the ceiling! That's all you need!
Good day

I used another rope to better adjust the seat height.