Glass canopy without posts - What kind of attachment is used in ETICS?

We have a concrete canopy that was delivered as a semi-finished part, with rebar protruding out the back. They extend into the intermediate ceiling and are embedded in concrete there, between the rebars a layer of polystyrene was used for insulation so that the roof does not conduct cold.

How big is your porch roof? Concrete is indeed the heaviest option in terms of weight...

About 1.5m wide and almost as deep. Although now, while searching for the photo, I'm not entirely sure if it is also attached on the side. Unfortunately, I didn't take a close-up photo that would have shown this.