I think I used a KFI plate on my Foreman, but I don’t remember for sure. RT2500 mounted upside down, works fine. I left the spool wound as it came. My understanding was you want the line to feed from they side of the drum closest to the mounting plate, to minimize stress on the winch housing and mount, but I could be wrong.
Only disadvantage I can think of for upside down mounting is the winch is lower, and more prone to being dunked.
06 Rincon 680. Foreman headlight conversion, Guru bumper, Warn XT30, Maier guards, Bighorns
05 Foreman 500 FM, 2.5 Warn, Bighorns
Dually Ram and Patio Hauler 5th wheel