Are pack n plays safe sleep for a tummy sleeping baby?

Hi guys so we are in a temporary living situation until we move into our house in a week. My baby has been sleeping in a pack n play for the last month in the top bassinet insert part. He just outgrew the weight limit so we lowered the pack n play to the bottom but my question is; is it safe for him to sleep on a pack n play if he sleeps on his belly? We place him on his back to sleep but he rolls to his tummy automatically no matter how many times we roll him back. When we move into our house he will sleep in his crib. He is 5 months old. Thanks for the input