I found a solution that is working and is so low tech!
A power strip that has some switched outlets, controlled by one main outlet. I have the Onkyo receiver as the switcher and the amps are in the switched sockets. When I hit the power macro on the tablet and it turns on the receiver, this outlet strip supplies power to the behringers. As long as I leave the rocker switches in the 'ON' position, they are now controlled via the tablet! Simple and cheap solution as long as it holds up over time.