I was looking for a power supply cover that satisfied all my needs but couldn't find one, so I made my own one.
This is a power supply cover for the new version of the Anet A8 and includes a fan mount for a regular 8cm fan and a socket for an IEC320 power switch. Like this one:
The "wall piece" on the left side protects your hotbed from airflow, so ABS and PETG prints don't cool down.
You will need three M3 screws for the cover and four M4 screws for the Fan.
There is one additional M3 screw hole on the left bottom for additional stability but you'll have to drill a hole into the Acrylic: I don't think this is necessary.