Ideal Fan Set-up for the Darkflash DB330M M-ATX Case

I only have 3 fans currently connected. 1 rear, which is for exhaust. 2 at the top for intake.

Is it ideal or do I need to change it?

Also, I saw photos of this same case with fans attached/connected just below the GPU.

Will it be even better if I add 2 more and use it as an intake?