Questions about 3090 cooling and form factor

[almandin]

Or maybe using pci risers to space the GPUs a bit, but I dont know how to fit them in a standard gaming case :/

EDIT : using a case with a vertical GPU would allow to use slot 1 and 3 horizontally, quite spaced from each other, and slot 2 with a pci riser, for the vertical gpu, what do you think of that ? Wouldnt it be a good compromise ?