JP - First, you'd need to find a power source for them that is low maintenance... Solar doesn't generate enough power with the tree canopies, batteries would wear out too fast, and it'd be uber foolish to run any sort of power line or generator nearby... People can't help but spraypaint the stones, what do think would happen with electronics?
Which leads to the second part, the stuff would get stolen within a week, guaranteed.
As for people moving stones, alcohol & drugs + groups of people who simply don't care = disrespect. Most of the stones from the Grove are in the pond. If people could move the Fulton stone, it'd be in the pond as well.
People think because the cemetery is abandoned that it becomes their playground... Foolish, but it's been going on for generations.