A holder for a SwitchBot Outdoor Thermometer and Hygrometer

The Switchbot Outdoor thermometer comes with a lace and some double-sided tape.  I did not trust the double-sided tape to hold for more than six months outside.  So I quickly designed this holder.  

The head of the screw can be 7.4mm or smaller.  And the shaft of the screw can be 4.1 mm or smaller.  The head of the screw can be at most 3.5mm deep.  The screw I used is some upcycled screw so I am not sure about any of its specifications. 

This is part of a project where am looking for the hotter air around the house to feed a heat pump water heater to make it most efficient.