Mount a small rocker switch onto a T- or V-slot profile with t-nuts.

The model can securely mount at the 90 degree intersection of two aluminum extrusions of T or V profile, using anywhere from 1 to 4 t-nuts.

Here's an example of the size rocker switch this mount fits: https://www.amazon.com/yueton-Pack-250V-Rocker-Switch/dp/B018FHB0H6