We set the feeder to feed in relatively shallow water that slopes to deeper water roughly from 2 to eventually 5 feet.
We were also strategic to not put the feeder near our gravel spawning areas. I thought this was important. I didn't want an influx of feeding fish disturbing active beds.
I also put the feeder in a place that was easy to access. Maintenance, cleaning, refilling of food, and fishing near the feeder was a priority when considering location.