Couple of thoughts - first, I have two horses on the property who stomp when they are eating out of sheer excitement. One of them even strikes a pose like a bird dog at the gate when they hear grain being poured in the barn and he is waiting to be let in! The major adaptation we have made is replacing the conventional feed bin in the barn with a full length "kick bin." Several companies make these, so ask at your local store or with your barn builder - the barns here are both Barnmaster so we use them. If you try to feed them with a pan or bucket, you will spend way more time than you want to picking it up, and you won't have a way to track whether supplements or medications in their food are actually being ingested.
Second, recommend giving some thought in general to what part of your care routine occurs while your horses are eating. We all get stuff done while they are chomping away (I, too, use the time to check the condition of each horse as part of the daily routine), but because they are so accommodating, if a task is performed only while they are eating, then a) they never become trained to develop the patience and submission for you to accomplish the task when they are not eating, and b) you may not know how they act without the literal carrot in front of them. A little off topic, and may or may not be applicable, but food for thought if it helps.