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