Almost all the modern day standard atx power supplies come with a 120mm fan that is mounted on the top bottom side.
Bottom mounted power supply carpet.
When intel designed the atx form factor the power supply fan was designated as the primary case fan.
This fan works as an intake fan for the psu that sucks in air and blows it on the components inside the psu where then it exits from the rear vents of the power supply.
The 200r is a solid budget case and it s got the bottom mounted power supply with the fan filter at the bottom so it can have it s own intake too.
When it comes to top mounted i m sure there will be cable management problems with managing the 8 pin cpu header so it looks neat but aside from that as long as the case doesn t suck it should be okay.
Being placed at the top of the case a power supply could.
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This will help prevent the psu intake fan from sucking in carpet fibers and helpless dust bunnies caught in the crossfire.
Just find a piece of solid material that will act as a barrier and place it between the carpet and your case.
Pc power supply discussion.
The problem of bottom mounted power.
Rosewill prism t atx mid tower gaming pc computer case with tempered glass 4 pre installed 120mm fans 420mm 360mm 240mm radiator support eatx support bottom mount psu shroud and hdd ssd.
If your case is resting on carpet consider placing it on a hard flat surface instead.
But if you don t have the computer on a carpet the bottom mount issue there is gone.
You can see the psu airflow in the diagram given below.