Question: What kind of feeder? J feeder or bowls?
Answer: We used J feeders a lot. These hang the outside of the cage and you cut a hole so you can put the lip into the cage. You can feed without opening the cage. We also used ceramic dog crocks because the rabbits cannot fling them around easily.
I did want to mention that no matter what feeder you get for the rabbits, don't forget to OPEN THE DOOR and touch the rabbits every day.
I found the J feeders made it more likely to pour feed and run down the row without really looking at the rabbits. Having to open the door with bowls made it necessary for me to interact a little bit with the rabbits, especially the hostile ones that wanted to fight over turf. So I had to pay attention to which cage I was opening.
Anyway, just thought I'd mention.
Have a good day!