Kingsyard Adjustable Platform Bird Feeder for Outdoors, Hanging Metal Seed Tray with Clear Rain Proof Dome, Large Capacity for Wild Bluebird Cardinal Goldfinches, Black

Round and tall or flat and rectangular? I use Kingsyard feeders https://www.amazon.com/dp/B08R8N9GQ8?th=1 They accommodate anything up to 7 inches tall and accept all of the store-bought seed cake towers I've tried as well as the homemade towers I make now. I have a platform feeder as well that I put a loose seed mixture in. They gobble that quickly and I've tried using seed cakes to slow them down but they don't like that. They will eat from the seed towers but resist the flat cakes in the platform feeder.