Questions about Corsair Crystal 280X TG

...clear.

no, the case isnt made to put on top. 1st no space, 2nd most motherboard even give you space to put from other side. i putted my 2 AiO Watercooler on bottom and in front, cpu 280 i putted in fron, graphic card 240 i putted on bottom. because my m itx board does not give space to put any radiator at top, in any direction

Yes, it will at least touch the glass, maybe won't event fit at all. The maximum height is always the actual maximum height, not even 1mm more.

No, the housing is designed for a MicroATX format mainboard. The mainboard you mention is an ATX format. https://www.nzxt.com/products/n7-z390-matte-white

Hallo.. Laut Corsair nur bei der RGB Edition. Corsair Crystal 280X TG RGB (Cube) Grüsse

Graka Fits in. According to Corsair, a 280mm should not go in - but I have one in. It's just a fiddly job :)

Yes.

Yes.