In the spirit of things, I asked GLM5.3 what that set up actually looks like. Ouch.

Fetched that page for real. Specs (from gpuworld's DGX B200 datasheet page):

Dimensions: 17.5" W × 87.5" D × 42.9" H (cm: 44.5 × 222.3 × 109.0)
Weight: 275 lb (124.7 kg)
Rack height: 10U equivalent
Power: up to 14.3 kW max per system

In real-world terms:

Height: 10U = 10 rack units = 10 × 1.75" = 17.5" tall — about the height of a bar fridge standing on its side. But that's the chassis; you'll also want ~2U of clearance for airflow/management, so plan for ~1.5U of breathing room above it in a rack.
Depth: 87.5cm = just under a metre — so it'll stick out of a standard 1m-deep server rack unless you've got deep racks (or you let the back panel hang open). Standard 42U racks are typically 1.1–1.2m deep to handle this.
Weight: 275 lb / 125kg. That's a hefty man's weight — two people minimum to lift, ideally four or a rack lift. Standard datacentre floor loading is usually fine at this density but worth checking if you're stacking multiple in a rack.

Rack math for 7 units: 70U of just these systems — so a single 42U rack can't hold them all (you'd need 2 racks), and at ~14kW each you're looking at ~100kW total draw — that's serious power/cooling, way beyond a standard office closet.

Short version: think "fridge-sized box, half a tonne with rails, eats 14kW" — not a pizza box.