This really works and is simple.  I have used two ways.   First, the traditional way.  I put it in the ground to prevent digging under a fence.  I put it ALL the way in and it stopped the digging.   Second, I used zip ties to secure it to the bottom of a farm gate.  When the gate is closed, the barriers fill the gap between the gate and the ground. No getting under the gate anymore!  I plan to buy more of these!