I mounted the contactor on the frame under the black plastic behind the seat with some flatbar that I drilled to fit. Just sandwiched the frame with 4 bolts works great stays clean and dry most of the time.I put the remote socket in the plastic by the storage compartment.
I mounted mine under the handle bar on the yoke, this requires you to switch the power cables, the long cables contactor to the batteries instead of contactor to winch. I used colored tape on each end to get the cables right since you are changing all the cables. I did this with a warn 2.5. I used velcro and ties to snug the solenoid on the yoke. No problems and the solenoid is always clean.