Can lay it flat and plop every heavy item you can find on it too. That’s what I did with mine and I haven’t noticed any issues. I am using the QCW on top of it though so that plays into things a bit.
A bit late on this reply, but I used 6 x 40 lb. bags of water softener salt (still in the bag), about 1/2 gallon of Titebond glue and a dozen or so screws. And DO keep track of the screws so you don’t forget to take one out and wreck a decent 1/4" bit 
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Has your top remained flat Mike?
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I believe so, Ken. I did not do a torsion box, just two layers of 3/4" plywood. I did mount a pair of 2x4s parallel with the short metal rails using the provided holes about 12" off center, which puts them at about the 1/3 and 2/3 marks. I notched and planed the 2x4s flush with the metal rails. I really should get a good straight edge to verify it’s still flat, but everything is performing like it should as long as I avoid the damn screws
Thanks Mike you’ve eased my mind because I plan on laminating 2 sheets of plywood for my top and supporting it as you did. I think I may remove the screws once the glue dries.
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Yes, remove the screws after gluing. Thankfully, the CNC has a great way to remind you if you forget to remove one.