Your case fits 120mm mounts in rear, top or front so you can basically stick that H80i v2 anywhere where there is clearance for the 2x fans and the sandwiched radiator. Rear is usually the best option, with 2x exhaust fans on top and 2x intakes in front.
The H90 isn't so much a step up as it's a single fan radiator that's not quite as thick as the H80i v2. It's just that because it's a 140mm radiator, it has slightly greater area. 120mm vrs 140mm (squared). Because of being slightly thinner, and slightly larger, the overall balance in performance becomes almost equitable between the 2 coolers. The advantage of the H90 is more in that it doesn't take as much depth, so is far easier to mount in front or on top. Less obstacles.
As is, your case has only 1 place to mount a 140mm, and thats as intake.
So, yes, it'll fit, front mounts aren't that much different overall, you get slightly elevated case temps, gpu temps, but lower cpu temps. ± @5°C on average.
A step up in performance from a H80i is the H100i. This is a 240mm cooler. Fits your case in 2x locations, either up top as exhaust, or in front as intake. Has the benefit like the H90 of being single fan depth, and very large cooling area (120mm vrs 2x120mm) but also has its drawbacks (never seen a 240/280mm mounted rear exhaust inside a case)