Support under Shapeoko S3

Does anyone have pictures of foam or what they use to help support center of older Shapeoko 3 . Foam,rubber,wood,yoga mats I am little confused on correct manor to help visual support. Thanks for any input

Search “Shapeoko 3 XL + XXL Progress”.There are some pictures. I removed the supporting legs. Polystyrene 1 inch foam (pink panther board).