Do you have a cooker AND a canner, or just a canner and you used both words?
Don't use the cooker for pressure canning, there's no way to ensure that canning recipe processing times will work in a cooker.
My pressure canner has the standard flat aluminum rack with holes in it which I use on the bottom, I also have a "cake-rack" style canning rack that I use in my water bath canner that I put on top of the lower level of pints to hold the top layer of jars so I can do two layers at once
Don't use the cooker for pressure canning, there's no way to ensure that canning recipe processing times will work in a cooker.
My pressure canner has the standard flat aluminum rack with holes in it which I use on the bottom, I also have a "cake-rack" style canning rack that I use in my water bath canner that I put on top of the lower level of pints to hold the top layer of jars so I can do two layers at once

apparently she was confident in my abilities from all the times I've helped her. Thatbsummer, Even after we ate tomatoes for every meal for a month and gave a lot of them away, I still ended up canning 60 quarts. She made green tomato catsup when she got back.