If Zigbee then Xiaomi Aqara Motion Sensor. Senses vibration, tilt, acceleration. Just stick it and that’s it, no magnet or anything needed.
If Zigbee then Xiaomi Aqara Window Door Sensor. Very cheap and works great.
If Z-wave, then in In both cases the Neo Coolcam door sensor. Works perfect, reasonably cheap and long lasting battery. You have to have room for the sensor and the magnet.
I have used a Neo motion and a Neo door sensor for the mailbox. When there is movement I get a message that the mailbox is full. When I open the frontdoor my outdoor hue lamps blink purple for a few seconds. When I empty the mailbox all is reset.