Hi there, is it possible to install a 240 AIO? or two 120mm AIOs on the bottom if I were to use a mITX board?
Yes.
Bottom can take up to 280.
You can fit a
pair of 240 (bottom & front) but thickness of rads & fans will matter.
A 240 will also fit on the side bracket above the CPU.
There are various caveats; If front mounting a rad then the PSU needs to go in its alternate location on the back bracket (over the CPU). Here even massive ATX PSUs can mount but CPU clearance is limited.
Have to ask, why ITX? Do you have the board already? The case is optimized for mATX so by going ITX you're giving up a bunch of potential features and
might be better served with an ITX optimized design (say, Ncase M1?)
Naturally, always check the specific combination of parts before committing. 'Standard' sizes like 240 AIO can vary a fair bit depending on end tank size etc.