I put an Americn Hunter under a 55 gallon barrel. I put a plastic "skirt" that went around and 10" below the opening to both protect from moisture and "drop" the feed in a small area enclosed with a 10' square "ring" of 3/4" pvc.. I also gave 5/8-3/4" clearance on the spinner plate to prevent a clog. It has worked flawlessly for 5 years now (2 for deer and 3 for fish).
Inside the barrel I put a funnel so all feed gets used and no worries of mold. It sets on a tripod over a drop-off on a submerged island. I sunk a small, thinned cedar in the drop-off too. I also use a solar charger and the digital timer slings 5 seconds 3 times a day, 8am/pm and 2 pm. I have the bottom of the timer 15" abovr the water surface. I the second picture you will see the one and only problem I've had---I set the feeder about 2 feet too low and it was submerged for a while when the pond filled. I dried all the electronics and it still worked although the LED screen is a little less bright now.
"Special" treat feeding time after an alum application.
Oops!