It does not decrease the printing area, but you need to turn the extruder stepper by 180° and extend the cable.
You need 2 m4x 20mm screws
I compared it against my 4020 fan mount. The 4020 mod idled at around 40°C and with the 5015 around 30 - 35 °C.
I apologize for the messy design, but the original files from Sovol where weird.
I dont know anythink about fluid dinamics, so there is stil a lot of improvement.
The author marked this model as their own original creation.