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Terrible idea. I supported a dozen Xserves back in the day. They were crap because they weren't designed for production use. They used nonswappable, commodity retail IDE drives not meant for 100% duty cycle operation. Fixed power supplies. Real enterprise servers were cheaper.

Mac minis don't have redundant power or ECC. You might as well run a bunch of RPis or PICs. Get yourself some real enterprise servers or rent some via a VPS.

Disclaimer: I use a Mac mini as my living room HTPC. I wouldn't run anything real on it. That's what I have a 96 thread EPYC virtualized box for.