You pay a datacenter to put it in a rack and add connect power and uplinks, then treat it like a big ec2 instance (minus the built-in firewall). Now you just need someone who knows how to secure an ec2 instance and run your preferred software there (with failover and stuff).

If you run a single-digit number of servers and replace them every 5 years you will probably never get a hardware failure. If you're unlucky and it still happens get someone to diagnose what's wrong, ship replacement parts to the data center and pay their tech to install them in your server.

Bare metal at scale is difficult. A small number of bare metal servers is easy. If your needs are average enough you can even just rent them so you don't have capital costs and aren't responsible for fixing hardware issues.