Even with all the screws removed if the hatch cover has never been removed you will need to pry it up with a small pry bar as there is a seal that is almost glued probably due to engine heat.
When I replaced my hatch I got plastic screw covers for each screw so I would never have to search again, they come in many colors and almost matched the carpet. Noticeable but DW approved
makes the job much easier the next time !