I second duppyy07's reply although I didn't need to set the GraphicsEnabler option. I could install High Sierra successfully, then run Multibeast but rebooting immediately failed with the table load failure. At that point, I couldn't boot the system again even with the USB OSX Install drive. I had to re-format the EFI partition (Ubuntu thumb drive+gparted) to be able to boot again. The Clover bootloader on the boot drive isn't being configured (I believe MultiBeast just writes to L/E and/or S/L/E but I've been only doing this for a few days so don't quote me on that.) Once I was able to install successfully, I didn't run MultiBeast: I mounted the EFI partition from install drive which I knew worked, copied EFI directory to the desktop, unmounted the Install drive, mounted EFI partition on the boot drive and replaced its Clover EFI directory with the one from the desktop/install drive. I can now reliably boot High Sierra and, once I return from a brief weekend trip, fixing audio, power management/sleep, etc. will be the next challenge.
UPDATE: After successful configuration the hard way, but while learning a lot, a re-installation using MultiBeast worked just a it should. The original problem: user error in not checking one of the Clover boxes in MultiBeast. This left the Clover plist/kexts un-configured.