No power everything with solar, water proof, these things hung still and in 3-5 minutes, material is already there. Perhaps no fischer plugs but that should indeed carry only 200 grams.
Simply drill a hole (I think 4 or 6 drills), anchors in, screw pure rotation around (Warning bit rausschauen leave), lamp mount, straighten, 2nd hole mark with pre braids hole in the lamp, lamp again removed, 2. Drill hole dowel purely lamp hook again and screw it up. Done.
Now I'm just curious to see how long do these lamps and survive the winter.