Sup /wsr/! I just bought this mid tower case with a rear stock

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141KB, 967x573px

Sup /wsr/! I just bought this mid tower case with a rear stock fan. It is my only ventilation so far. Im planning to buy additional fans sometime this week. (See pic related)

Im familiar with airflow concepts. (Cold air goes in from the front/bottom. Warm air goes at the rear/top.)

My question is, is it worth having 2x120mm fans at the top of the psu shroud?
Will it improve/disrupt airflow?
Will it potentially improve dust build up? Should I use a high airflow fan or a static pressure fan?
Should I consider going for negative pressure or positive pressure?

Case: DeepCool D-Shield
Cpu: Pentium g4560
Board: Asus h110m-k
Ram: 1x8gb HyperX Fury DDR4
Psu: Seasonic S12ii Bronze 80+
Gpu: Palit StormX 1050 Ti 4gb DDR5
There is no exhaust fan mounting at the top. Only at the rear.

Ambient Room Temps: Around 28-30C in the morning and goes to about 32-33C from Noon till before 1800h.
I use my rig for casual gaming mainly on open world games like Fallout4 and Mobas.
I play about 8-15 hrs a day.

CPU and GPU temps at idle: 40C and 32C respectively.

CPU and GPU temps at load (gaming): 45C and 38C respectively.


I live just 13 degrees above the Equator so it's quite hot in here especially summer.