The only way to access these clips is through the ventilation holes, .. how convenient !

It's enough to unhook 1 clip per side, and one of the clips cannot be unhooked, as it's blocked by some black paper plastic rubber thingy

In case you have something thin and strong enough to do this without enlarging the holes: please leave a comment down below !

I drilled through the existing holes to make them large enough for a fittingly stiff screw driver