Nope - it lifts right off. The weight of the trap keeps it in place. I guess a vandal could take a heavy stick, limb and push it up and off if they wanted to. You can't prevent the motives of pricks that want to trash your stuff. There is another post (which I could not find - if I do, I will post a link) where someone tested the strength of the cleats to see what it took for them to fail.
This is where I picked up the idea from - an earlier thread -
You can see a couple other pics I posted there - Post #34
I caught two swarms this year along the gas line shown in picture #2 of the post above. One in the trap pictured.