A plate comprises a planar central region with a perimeter and a lip with first and second sections, each including two ends. A first end of the first section extends from the perimeter up and away from the planar central region, and a first of the second section extends from a second of the two ends of the first section down and away from the planar central region. A plate comprises circular, mid and end regions. The mid-region protrudes from an outer edge of the circular region in a first direction away therefrom. The end-region protrudes from an outer edge of the mid-region in an opposite direction and away therefrom. The mid and end-regions include openings. A plate comprises a first area and a rim surrounding the first area. The rim has walls which intersect. Each of the walls is either straight or concave. Both of the walls includes openings.