Hey, I would say neither option and go with a third. The notches on the kidney plate are optional even for Centurion. Due to the way WTF armor goes together it would require alot of extra work to make it screen accurate so if I were you I would shim straight across. The WTF kidney plate is simply not tall enough.
Screen used armor:
Diagram in full:
You might wanna wait for ”those in charge” before you decide on what you want to do, best of luck with your build