Cats!! But where are they when there are rats around?!
I use a sheet of perspex type stuff propped up on 2 or 3 litre flower pots full of soil. With something on the top to weigh it down. Just things I had around. But you could use a sheet of wood. Some very persistent cats crawl on their bellies underneath mine occasionally (looks a very uncomfortable position to eat in!), but most leave it alone. You could position it against a wall and put the food near the wall, so the furthest distance the cats would have to go. I have found over the years that some hogs don’t like going into hog boxes, but they seem quite happy to go underneath the perspex, which of course provides more potential exit routes for them.
Hope you manage to find something.