Do you ever get squirrels?
Then they'll love the feeders ! You can get squirrel proof ones apparently, don't know how successful they are. I find them quite entertaining as they only turn up now and again, but it could get pretty annoying l would imagine. With regard to the robins and blackbirds, they prefer to eat at ground level.
My MIL used to have an old dustbin lid,on top of a couple of bricks. She put some big pebbles in it and used it as a bird bath. The sparrows used to love it ! These days she has a very nice shallow Cotswold stone one which is well used, but l bet the sparrows miss the old bin lid. I do !