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Use batons at side and along back. Batons are better than brackets as provide wider support and are less intrusive for knees etc.
It's quite a wide span. I'd expect most 1-2" ply boards to sag over time, due to their own weight. An IKEA table top might work as they're quite light. Kitchen worktop might he ok but again, is quite heavy and is designed to be fully supported underneath.
Any board could be stiffened along the front edge by running a strip of 1"+ profile angle iron between the side batons.
Matt101
@dst2
Could something like ....https://www.screwfix.com/p/heavy-duty-bracket-black-300-x-300mm-2-pack/78941?tc=FA8&ds_kid=92700058173294173&ds_rl=1244072&gclid=CjwKCAiAsOmABhAwEiwAEBR0ZqAzMT0o0keat-92P7pyGreU0A_CHFOeSeIQz1Cm_HPCF4lXGS3IlxoCn6gQAvD_BwE&gclsrc=aw.ds
At the back do it?