I bought a zigbee temperature sensor here : https://www.amazon.ca/THIRDREALITY-Temperature-Thermometer-Hygrometer-SmartThings/dp/B0D2NVJTS3
And I wanted somewhere on my shelving unit to have it. Since it has no wires I wanted to just mount this on the shelf's rails.

So I remixed both these models into this, hope it helps you too!