Follow the instructions to create the Mac OS High Sierra installer.
After creating the usb installer. You have to manually edit the config.plist with Clover Configurator. The SMBIOS is the only part that needs changes. I used Imac 14,2. Save when done.
Like what I said in my previous message, I cannot install this on a SSD drive but try to see if it will work for you.
If you don't make the above changes, your system will just keep on rebooting during installation.
Complete installation using Multibeast.
CLick the link below to install an older version of AppleAhciPort.kext to prevent disk I/O error while booting up. Here's the link:
https://www.tonymacx86.com/threads/disk-i-o-error-while-boot.238288/page-2