If you're going to go ITX mobo then you could easy do a 240 at the front and a 120 on the bottom.
You considered a parvum S2? its similar in shape although different in style to a 240.Plus its well designed for mATX watercooling builds.
99% certain that doesn't fit, it's too wide for the front, I looked into it when I first saw it because I'm interested in the air 240 too
ek predator is about 20mm wider than say a corsair h100i gtx due to the pump being on the side of the rad instead of over the cpu.
And to be honest the difference in cooling between those two isn't very much according to ek's own stats.