For heavier works of art and objects, you can use rectangular bars of 4x4 mm. These obviously require crochet.
Here you see a number of different clamp hooks. Hooks that fix themselves at the height where you let them go and put weight on them.
Various versions of the Artiteq brand and one of Newly. The load capacity per hook is different and varies from 40, 50, 60 and even 100 kg. You will understand that the rail must also be suitable for heavier objects.
Two anti-theft systems are also available for these bars.