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Anyone know what elevation drones get to when they "float"?
They don't change elevations. Their unit attributes are altered to allow them to pass through any terrain.
You understand that there are so many hacks, and you should limit it to the units in your map. Some hacks also cannot be detected or stopped. There are ways to fool certain hacks though, Ex: The ally alert features comes standard with many, and getting a computer player to keep allying/ ally vic/ unallying all players will cause the hacker to be spammed with alerts. Unit Alert works the same way. Create a bunch of carriers/etc in a corner, remove them, and repeat, and the hack will spam the alert messages.