i have a set of mounting brackets that came with my kicker box, honestly you could just do a simple easy mount and get some L brackets from lowes and mount like four of them along the back and mount them to the floor, or 2 on each side, 1 on each side 2 on back, however you like.
could paint em black or whatever color to blend in and call it good imo
thats basically what came with mine, they are black l brackets
http://www.homedepot.com/catalog/productImages/300/10/10731e50-5e45-486c-8bc9-105a197476b5_300.jpg
of course youd have to get longer screws or something when they mount to the floor
if it didnt have to be bolted i would say hold it down like i have mine LOL
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