the human interface module (power consumption meter) that comes with CM Real Power PSU series mostly can't be screwed due to the short dimension on the device there.. even in Cooler Master casings..

use a double-sided tape that put beneath the device will solve the problem of providing fixing displacement there

all CM Cooldrive / Aerogate module items will fit nicely when ever there is an unoccupied 5.25" front bay area in any casings