Lamp Concrete Base Mold with Threaded Screw Holder

I have installed a whole series of outdoor lamps/outdoor base lights/path lights from Hornbach on my property.
Specifically, this model:
Outdoor base light 1-flame H 45 cm Dody black
It is inexpensive, visually appealing, and can be equipped with Philips Hue lamps.

I wanted to mount these on a nice concrete base that is no larger than the lamp itself. However, these always broke when drilling. Therefore, I printed this thin mold, which contains two mounting points for threaded screws at the top, which I secured there with nuts and cast into the concrete. Afterwards, I simply broke off the thin casting mold and beautifully painted it with anthracite paint. I was able to perfectly cast and attach 6 of them this way.

The inner diameter is 125 mm.
The outer diameter is 127 mm.

The threaded screw centers are 100 mm apart.

The model is intentionally only 1 mm thin-walled so that it can be easily removed after the concrete dries.