The 2018 i7 maxes out at 122W. The M1 Max in the 16” maxes out at 119.8W. So a single M1 Max is likely the limit the current mini design could handle, but with the Intel design there is some thermal throttling after sustained periods of time.Dual M1 Maxes would generate approximately the same heat as the current intel offering in the current chassis, maybe ~10-20W more, something this large would have bundles of headroom for that. I'm intrigued but this concept, almost to the point of waiting on an upgrade to see I'm unlikely to be able to order anything tomorrow. Given the maxed out MBP are now shipping in May (which is insane), I have no idea on how volatile the lead times for these machine will be. The M1 Pros seem to be catching up, but the Maxes are getting worse. I wonder if this is a power-binning thing, or maybe the yields are just terrible?
So no, AFAIK dual M1 Max chips would not work in the current design, especially under sustained loads.
I am unaware how a dual chip functions, but if the M1 max uses ~120W would this mean we should expect a dual chip to reach 200W+?