I modified this excellent design to fit my printer (my heat block is on a significant angle). This uses a single screw to mount to the Aero with a small ridge for support.
I also modified the air openings so that are now 45 degree downward facing slits... had some problems with thermal runaway prior.
... although this setting was probably the actual solution:
I print in PLA at the moment and the fan duct is holding up without deformation.