Unfortunately it's probably not as simple as that, as it's not just a matter of getting them to physically fit.A cursory glance suggests that providing they keep the same width, they wouldn’t necessarily need to replace the racks rather than modify them to hold 2 in each slot, or maybe engineer cages to hold 4x per slot. Proving they can modify suitably to power that configuration per slot, that may work.
Specifically, take a look at this MacStadium blog ( https://www.macstadium.com/blog/digging-deeper-into-2018-mac-minis-at-macstadium ) where they described putting a lot of work into designing the current shelving configuration for their Minis, because their previous configuration wasn't providing the right airflow, causing the Minis to overheat and fail. And it wasn't just about the amount of airflow, it was also about its direction, since that needed to be synergized with the airflow in the room:
Our internal lab testing, performed even at a single rack-scale, demonstrated not only significant issues with thermal throttling but several cases of thermal failure under consistently high workloads. Our engineers quickly coined the term "bacon pans" and got back to work solving the problem.
We went back to the drawing board, well, back to Solidworks, designing a new, higher-density, better-sealed sled that allows us to realize the benefits of hot aisle/cold aisle airflow containment within the data center, provide more efficient cable management/routing, easier installation, and additional security for external HDD installs, and optional active per-sled exhaust fans.
This new sled ensures cold air ingresses where it's supposed to and flows over as much surface area of the mini’s chassis as possible, egressing on the hot side quickly with minimal stalling.
Granted, these were Intel Minis, and had higher power densities. But if you put Minis in Apple-TV-like cases you're also going to get high power densities. Thus they'd likely need to do a similar optimization in designing shelving for downsized Minis, particularly if they wanted to achieve a dense packing.
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