The Programmable Digital Slave Unit from Nisha features a rotating head with a rotating hot shoe on top, and it can be programmed to ignore the pre-flash from your camera and fire only on the final flash. It includes a PC female outlet and has a shoe mount/tripod socket in the bottom.
Rotating hot shoe
Programmable to ignore camera pre-flash and fire on final flash only
One PC female outlet
Shoe mount/tripod socket with thumb nut