IoT experimentation, midi pipe organ pedals and remote controlled passive XLR summer

You won't like the component drawers up there.....

Edit: Oh, yeah, you said you were getting the desks from a company, and they're build ruggedly - so nevermind most of this...
Are you building the desks yourself?

If so, why not use plywood for the two sides and the back, like I do? That gives you something to anchor a shelf to underneath, and also helps support the middle.

We used 2x2's along the edges of the plywood, each one permanently screwed to one piece of plywood, with holes through it and bolts on the other side - so it can be easily disassembled and reassembled when moving (that lets you make a desk that's too big for the door).

No matter what, you need support under the middle of the desk, assuming that's a sheet of plywood of reasonable thickness. Otherwise it'll bend like a wet noodle when you start putting stuff on it - particularly if you don't have a support along the back (and even if you do). We use 1" steel square (hollow, not solid), 2 pieces, for the 5' span, and two 1.5" ones for the 7' span - and it is rock solid.

What are you using for the surface? Bare plywood is no good - it gets stained like nobody's business. It needs to either be treated, or you use masonite. I recommend masonite, because it's cheap, and as it gets worn, you can first flip it over (if you got double-sided kind), then just replace it. With another easy to cut rectangular piece of masonite!