I have the CoolerMaster version which is designed to fit four 3.5" drives in the space of three 5.25 inch drive bays:http://www.newegg.com/Product/Product.aspx?Item=N82E16817993002
The front grill is held in place with small screws. I used a jeweler's screwdriver to remove it so the fan and bay adapter are mounted and behind my case's mesh bay covers.
I did not install my ssd into the 4 in 3 adapter. Instead, I purchased a Silverstone bay adapter that fits 2 ssd's in one 5.25" bay:http://www.newegg.com/Product/Product.aspx?Item=N82E16817997007
I had a couple of unused bays. Their location did not interfere with airflow, ventilation, and cooling.