I made a bracket to attach a led strip (e.g. https://www.amazon.de/gp/product/B08VJ65WSV) to 3030 aluminum extrusions, in a 45° angle. It just snaps onto the extrusion.
The model is only 20mm long, just scale it to the length you need.
Print with the flat side down.
The author hasn't provided the model origin yet.