I agree id deffo give the top vent a go.I would take the fans off the roof and attempt to install there mate, it's definitely worth a try. It's a pain mate I know but be good to rule it out, certainly not ideal to have it where it is now
I'm glad someone said it.if it annoyed me I would just drill holes.
Me too but you've seen what I've done to my case so I'm not sure I'm a wise person to take DIY advice fromIf the roof doesn't work I would probably just mount it with the 4 screws at the higher level...... if it annoyed me I would just drill holes.