nice rendition - someone works with or in solidworks
the advantage to placing the fan parallel to the ssd is it blows air across both sides of the controller, ie front and rear
This isn't a critical heat situation, so fv's approach will work, but in general, blowing directly or perpendicular to the controller's surface will create turbulence, ie air flow hitting it will bounce back toward the fan and inhibiting the airflow, so you get a lot of wasted airflow. Look at car radiators - what's cooling the radiator is air flowing over the honeycomb of aluminum fins, ie the airflow is parallel to those small fins
i worked on a project for a water cooled airplane engine - when the airflow was more than 3 degrees from parallel with the fins (or perpendicular to the face of the radiator), water temps went up. The issue was on climbing, as when the airplane has taken off and flying to altitude, the airflow into the engine cowling is or can be as much as 45 degrees off perpendicular to the radiator's front. As that air flow breaks over the front edge of the fins, it turns to turbulence and separates from the surface of the fins, which means no heat is being scrubbed from the fins, or less heat is acquired by the air.
that and the limitation of space in my case made me mount it the way i did. If i'd have put it the way fv did, the back side of the fan would have been awfully close to the case side cover, restricting air to the fan, with the front of the fan awfully close to the controller. The effect of turbulence would have been worse
just as an fyi