Afaik it only comes with one of those brackets and two are necessary to mount on the top and front simultaneously. TT does this with basically all of their cases that have some kind of mounting bracket. I used to have a core V21 and I ended up buying another one second hand just so I could get...
I've looked at this case extensively for my next build. Should be able to mount 2 420mm rads simultaneously in any of the designated locations on the case. I plan on doing a 420 on top and one in the front with an EK FLT 360 res on the side. I'll have to get another mounting bracket from TT though.
1. Open air/open frame cases tend to be cleaner than enclosed cases because there's nowhere for dust to get trapped.
2. It also depends on how dusty the area is where there the PC is kept. Just like ambient temps heavily influence how effective the cooling solution will be for any PC.
3. I'll...