I made a mount for the Sonoff SNZB-03 sensor! Here are some details:

• Designed for: Sonoff SNZB-03 sensor.
• Screw hole: 3mm, for easy hanging. (example TX10 3mm
• Printing side: Sloped side should be on plate
• Strength: I used 4 walls for a solid print.
• Layer height: 0.20mm

This is a very small print.  Important to print on the slope side and not on its back for strenght to squeeze hold the sensor.