Buying a NEW DC/Corporate server for usage at home brings too many issues:
a. You only buy one, the provider will not give you any discount. DC/Corporate hardware prices are always hyper-inflated so that during the deal negotiations the provider will give a significant discount as last nudge toward a deal. Prices are also higher because the manufacturer and provider guaranty support and availability for 10 years, as an example.
b. For the noise, unless you want to transform your living room as an airport (sound-wise), the best solution is a sound-proof basement or attic. Great for making the lives of rats a pita.
c. After you spend your hard won kopeks on a new shiny 100 GbE capable server, be aware that the rest of your computers will have to be PCIe 3.0 or PCIe 4.0 with a PCIe x16 slot dedicated to the NIC plus something like a local NVMe RAID 0 or 10. Anything under this will result in very disappointing results during file transfers. You end up with the local buses being slower than the network (!) A PC with PCIe 2.x will choke at around 20 GbE.
d. You'll want to run the thing with a beefy UPS.
e. You'll want to run the thing 24 x 7. The power bill at the end of the month will reflect that...
CONCLUSION: Don't do it. A more "valid" path is to buy used DC/Corporate hardware on eBay or alike. But you have to know what you're doing and do your home work, pun intended.