Gutter Feeder

I bought some gutter to use as a feeder with the intention of setting it on the hollows of concrete blocks, but it turned out that the holes in the blocks were too small for this guttering to fit in. My husband chiseled out some tree pieces to sit the gutter in and each end will be raised slightly more with a block. I intend putting this in the covered area of their run and will take the food in at night. Just a little concerned about them sitting on the ends and pooping in the food. Would you trim the ends as close to the trough to try and prevent this. Have any of you made something like this?