I’m about to do something similar.. with almost the same build with a distribution plate. I guess the biggest question is where are you putting the distribution plate? In the front or side? If you place it in either location. I would assume the top is still accessible and either the front/side for the 2nd rad.
From what I’ve seen. People have put the distribution plate in the front, a rad on the side and rad on the top. I could be mistaken, but I don’t see why it wouldn’t fit seeming how the distribution plate is smaller than 3 fans on the side or on the front. Theoretically 3 120mm rads could fit in all 3 locations simultaneously. I wouldn’t suspect the distribution plate to stop that.
Yeah, you’ll lose the bottom because of the vertical GPU mount. But the top, And side is still accessible.
"My PC is a work of art, it shall never be disrespected placed on the floor. If anything it would be placed on a pedestal.