Questions about Multibrackets Cable duct

No, it is not self-adhesive.

You could stick it on with double-sided tape. We taped it to the floor and it works perfectly.

Yes, for the widths 33mm and 50mm I found the following brackets in the range: https://www.digitec.ch/search?q=Multibrackets%20winkel

Unfortunately, the manufacturer does not provide any specific information on this.

I think it is possible to paint this article. However, regarding the choice of paint, I would, if I were you, ask for advice in a DIY shop, in order to choose a paint that adheres completely to the surface (to avoid the paint flaking for example).

The channel on the model, which is 18mm wide, is 12mm high.

We cannot answer this exactly because it depends on the diameter of the cables. This rail would be 5 cm wide and, depending on the cable thickness, 3 or more would fit in there, for example.

Enclosed is the information: 12x1100x8 mm (WxLxH)

Yes, aluminium is usually grey...