Piezo film installation

I have some piezo film, now my idea is of course to install it on my bridge, but the question is how? I searched the internet for the correct way to do it, but not really any luck. From what I understand of how piezo's work it just has to be in contact with the bridge anywhere. Would it be possible to unscrew the bridge, put the piezo film underneath, and then screw the bridge back on? Will this damage it in any way by squishing it? Or do i just put the film behind the bridge? It would look a bit uglier that way.