I didn’t glue it on Velcro, but simply put it in the right places so that the necessary sectors overlapped. When there are a lot of small items on a table or chest of drawers, the sensors are not conspicuous, this has its advantages. In general, I am satisfied with the sensors, they register me clearly - a notification immediately comes to the application. I hope that you will not have to check them "in action" for their intended purpose.