Success Build.
ASUS ROG Z390 Maximus XI Extreme
ASUS ROG Strix Vega 64
ASUS ROG RYUJIN 360mm All-in-One CPU Liquid Cooler
ASUS ROG PG348Q SWIFT Curved 34 Inch UWQHD (3440 x 1440)
Razer Nommo Pro: Gaming Speakers - THX Certified Premium Audio
Corsair 32GB Vengeance LPX DDR4 3200MHz RAM (2x 16GB) running at 2133
ENTHOO EVOLV X GLASS Case
Magic Keyboard with Numeric Keypad
Magic Mouse 2
Magic Trackpad 2
BIOS version 1005, 1105, 1305.
macOS 10.13 - 10.15 tested and only Built in Wi-Fi and Bluetooth do not work but I have installed a ABWB 802.11AC WI-FI With Bluetooth 4.0 PCI-Express (PCI-E) BCM943602CS.
See attached for BIOS Settings and EFI.
Attached pictures of BIOS Setup, Update to 1305 (latest BIOS version for the board), and full EFI to install and run. Please generate your own serial numbers and UUIDs. Else I have changed them to random in this folder.
This works as an install and as well as an everyday EFI folder. If you are doing a dual boot, please install Windows First because I have had an issue where Windows will put its EFI Windows content into the macOS EFi and when changing EFi folders Windows would fail. All USBs working full speed. Mapped DSDT included. Intel QuickSync working.
This has been pieced together over time and I have settled here now until the next version of macOS comes or I buy a new board.