I'm trapping a 2 acre pond that was created by beaver. Approximately, how far apart should you place castor mound sets? I've put in a few along with crossover and blind sets. Thanks for any advice.

Really hard to say without seeing things...according to the lay of the land. Pick easiest spot that has a natural funnel to it. Play the wind...set downwind if possible.

I just space them far enough apart that they can't reach each other when caught. I caught three of them one night on a stretch of 50 yards or less.