@amd
I've bought from that site before and have never had any problems (shipped to US).
For me, I bought a 10-pack of reed switches that look like these from AliExpress and put the magnet end on the garage door I think on my door, that part is metal, so it self-sticks and used a few blocks of wood to mount the sensor and then used some LED wire to run to an ESP8266 with ESPHome loaded up to connect it to Home Assistant.
DIY wins on cheapness and versatility since I also use it to also trigger the garage doors to open/close and sense motion, but that tilt sensor would probably beat it in convenience alone as long as the z-wave network is good.