PECO LECTRICS for Peco Setrack and Peco Streamline, all gauges (click on second picture for mounting details)
PL-10, PL-10E & PL-10W for operating turnouts by
remote control from N to 0 and SM-32
The most reliable, discrete and simple method is to clip one of these directly to the underside of a Peco turnout. Requires a rectangular hole 40mm x 24mm.