good value at the Vibekiller is ok and they are also eigendlich easy to install, provide only difficult to access and can be mounted full frame fans on either side wirds closely because the Vibekiller unfortunately total only about 20mm long and a standard fan 25mm thick. When looking at the side no longer to get the bolts to tighten, a montage is unfortunately impossible. In this case it would be better on that. with a length of min 35mm recourse.
