No, the outline of the basket bottom would sag below the very center supported by the rack. The bottom of the basket deforms over the time. The sides deform too, but the process is slower and the changed shape is there easier to tolerate. When the deformation occurs, the small eyes in the basket mesh may crack. Note that the latter cracking occurs for any basket out of the fine mesh that carries loads. After a while you can just replace the basket. At times I fixed the places that underwent particular damage - here I refer to the bike baskets in general under my care.
I have a wire basket, not a mesh one. How do you fix a mesh basket?