Modeled a matching baseplate and added a remixed pipe clamp from Excel102.
Please do not try to screw directly into the plastic, the Blink Floodlight is rather heavy and might fall down. Use M3x5x4 Heatinserts and M3 screws like you see in the pictures.
Printed with an 0,28mm layerheight in Extrudr XPETG, optimized for strenght and not looks :D
I included separate files for everything if you want do adapt to other sizes.