VMWare ESXi officially supports Mac Pro hardware as a host. Guests will just work--you don't need to use any of the hackintosh bootloaders.

If you aren't running ESXi (or VMWare Workstation) on Apple hardware, you can use this to enable the functionality: https://github.com/DrDonk/unlocker

I've come across this[0] doc before, but I haven't tried it yet so I can't speak to ease of setup and performance.

[0]: https://github.com/geerlingguy/macos-virtualbox-vm

If you dont mind downloading a potentially sketchy random VM image from the web, this has worked for me:

https://techsviewer.com/install-macos-sierra-virtualbox-wind...

A few days ago I used this guide to install Yosemite on an AMD computer with Windows 10 as the host using Virtualbox. It works but there's no accelerated graphics so it feels like working remotely.

https://techsviewer.com/install-mac-os-x-10-10-yosemite-amd-...

The trick is to use VirtualBox 4.3 instead of 5.