Nope, doesn't matter if they are hung off the ground or not, the rodents can jump, the chickens will rake the feed out. I had 2" diameter holes drilled in mine and a hinged lid made of the same PVC that I could close at night. Rats chewed through it in a few days. And it was a pain in the politician to fill with feed. Started using a metal hanging feeder till I realized why it was swinging when I opened the coop door during the day.
Start searching the forums for treadle feeder advice, do the same online, you are going to pay for a good feeder even if you don't own one by wasting feed or wild birds and rodents stealing the feed.