The "Mate" plate and mat for toddlers keeps a three-sectioned plate stuck to a table top, with snap-on fork and spoon to match. It won't stop your larvae from slathering themselves in muddled pork gravy, but at least they'll have to work harder to up-end the whole mess onto the floor.
The Mate is $20. The plate snaps out of the mat for easy clean up and is dishwasher and microwave safe. We should get one of these for Brownlee, but then he'd suspect we're trying to move him on to solid foods.