I bought a case with enough GPU clearance, without realising the radiator for a liquid cooling kit I got was much thicker than standard (Arctic Freezer II), so I had to get a new case for that.
It's good practise to measure everything with measuring tape, I reckon.
My first case didn't even give that option lol. Was a rather odd design. I'm using a Corsair case now and decided to front mount, with fans at the top for exhaust. My room gets a bit hot, probably from all the weed, so when I'm gaming it helps exhaust the air from the GPU.
I didnt say I mounted I "plopped" it on top. It is only attached to not fall off, but it moves. And there is a huge ass hole beside it so the tubes have room to get into the case. Welp, too lazy to get a new case for now so that is how it is going to be.