I normally mount the crossover parts for the Neo 2X's I build on a piece of 1/4" thick MDF cut 5" W x 7" L. Also, I glue 1/4" thick x 11/16" O.D. flat rubber washers on the bottom of the board at all four (4) corners and secure to the bottom of the cabinet with No. 8 x 1" L hex head sheet metal screws.