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Catching ghosts is quite tricky when you are overleveled (they are gray cons). I would say anything beyond 15ft or so from the trap wouldn't count, but that's just my approximation. We had the best luck with a Brute with Taunt.
They need to come up with some sort of effect or marker that shows when ghost will count. Would be nice to see a blinky effect around a ghost when he's in range, and then you know it's good.
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There is actually a sign that you have captured a ghost successfully. Normally when the ghosts die, they kind of hang there in mid-air and disappear. When you defeat a ghost near the trap successfully, you'll see a green light fly from the corpse of the ghost, into the trap and the trap will shoot out a green-ish haze out from the center of it. Also, to note, when you trap a ghost, sometimes the trap will go bonkers and green-ish light will spew out everywhere, causing a group of lvl 10-15 ghosts to spawn around the trap.
This spawn includes minions, Lts, Bosses, and an Elite Boss ghost. Just be forewarned when this happens. Trying to do this in a group of 3-4 at level 10-12 is very difficult, if not impossible. I took my MM back at around level 20 and laid waste and got both badges in about 90 minutes.