You can mount several rocker switches in a single cutout with these stacking brackets.
These Rocker Switch Modular Bracket Kits are designed for snap-in mounting of any regular size switch such as Cole Hersee's 56027, 58031, 58332, 58311, and 58312 series. Bezels can be arranged in a parallel array of any length. Bezels themselves can snap into a panel or be mounted with the Bracket Mounting Kit. For example, if you wanted a three-switch panel, it would require two ends and one middle. Singles are 2 5/16"H x 1"W and doubles are 2 3/8"W.