Does anybody else know what the nature of the "tampering sensor" and why there are exactly 2 of them? I'm guessing the reason for multiples is redundancy, but,

Does anybody else know what the nature of the "tampering sensor" and why there are exactly 2 of them? I'm guessing the reason for multiples is redundancy, but, then, why not 3 or more? Also, amusingly, I read "Fall detection sensor" as "Fail detection sensor" at first, and was really confused as to what that was. :P