Private what? There is nay such thing as privacy... ok ;p
My tactic only involves finding IV and III worlds that are un-alerted and kill off their command station with MK2 or MK3 eye bots. Of course not all at once, but early or late enough so that i could survive an attack from those few ships there ;p
This doesn't really work well with MK1's but so far i could kill every command station with eye bots , even shielded ones, of course i loose them in the process, the reason is i don't want III or IV worlds alerted and alive at all, those spawn very strong cross planet raids and so killing them stops all annoying reinforcements of tech 4 or tech 3 ships - Maybe a risky tactic, don't know how it works beyond 2 hours, but the first 2 hours i killed pretty much all IV and III worlds i could find. This obviously doesn't work against counter spies though and sometimes i need all mk1 eye bots to clean a wormhole from tractors and then move the MK2 and MK3 ones through quickly (a bunch of mk3's is enough to take down a command station).
So far i have not seen the AI desert its posts when attacked by cloaking stuff, so yeah.. The tech 1 planets are alerted but i clean their guard posts and leave them alone, keeps unit counts anywhere close to me very low, and i do this for ALL alerted planets (of course when i kill a command post, i continue neutering guard posts all around those to prevent more reinforcements coming in.
Obviously MK1's are only my turret cleaners, the really kick ass units are MK3 eye bots - as long as you get close and cuddly before firing its 1 salvo or 2 and then run and hide, taking down all turrets and the command station in the process.