I have used rubber pans on the floor, but they get pawed at and flipped over wasting feed, and when empty they become toys and poop catchers...eewwww.
Then I went to buckets hanging from eye hooks with snaps, but they tend to cause rub marks on faces just above the eye from the metal handle they hang from. And they get flung around when almost empty and waste the last bits of feed.
So next payday I'm going to buy a triangle corner tub. I used them at a barn I boarded at years ago and seemed to work really well. But, I was trying to save money since I already have tons of buckets and a few rubber pans. It's taken me 8 months with Fayde to get tired of fighting the buckets and pans and going back to what I know works.