In my experience, I would put your bait piles as far apart as possible.
When I lived in South Carolina, I had access to around 2200 acres of hunting land, which was broken into over a dozen properties.
At one point, I had over 12 corn piles out. In either 2008 or 2009, I had photos of the same hog at six different bait piles in one night. The distance between all the piles was about three forths of a mile.
Until then, I’d wasted a lot of time putting out as much corn as I could. In retrospect, I’m sure I passed the hogs going back-and-forth between bait piles.
When I reduced the number of bait piles, my sightings increased.