Here are the rack ears you will need.
http://www.sweetwater.com/store/detail/1202vlzear/
You may be able to find them cheaper like on ebay. That mixer requires about 7U max so that case is just fine with extra space. But depending on the depth of the other units you are considering for the top section, those may not work if you plan on closing the system for moving. When the top is closed, it gets real close to the other bottom mounted processors and may conflict!