I realize this is an old topic, but it helped me go with this as my solution for my garage door entry sensor:
I never thought of placing the entry sensor here. Hopefully the adhesive holds the sensor in place.
So far, works well to have my Amazon Alexa announce the garage door is opening, and to light up multiple lights in the house if the garage door stays open for longer than 3 minutes.
Update: I have Alexa state “Garage Door is Closed” when the contact closes.
Update2: and why I didn’t do this before, Alexa now says “Garage Door is Open” when the Contact opens.
I just wish there as a means to have Alexa tell me the Garage Door has been Open for 5 Minutes, 10 Minutes, etc. and then at a given time, All my selected devices in the house either light up read, or alarm to let me know the door was not shut when it should be.
SJ