Burry the cables. Won't protect you from everything, but makes it a bit harder to compromise them. You can even have "cages" around them that alarm a nearby res

Burry the cables. Won't protect you from everything, but makes it a bit harder to compromise them. You can even have "cages" around them that alarm a nearby response team of any manipulation. Of course, this adds siginifcant cost, but then you have to take the total economical cost into account if an attack is successful.