Had to make space inside the case and mount the fans on the other side, i.e. on the outside of the case.
But then I had extreme airflow problems because the fans were only a few mm away from the original glass plate.

But with this remix everything is fine again and the airflow is right again.

AMAZON link from the case…

my print settings:

• Rafts - Brim: NO
• Supports: NO
• Nozzle: 0.4
• Resolution: 0.2 - 0.28
• Walls: 3
• Infill: 10%
• Material: 
  • Brand: Prusa
  • Material: PLA
  • Color: Galaxy Black

printed on Creality Ender 7