On my 2015 I mounted the solenoid on the plastic piece between the battery and engine. It's solid. I used large flat washers and lock nuts on the engine side. I've got pictures somewhere as soon as I find it I'll post them.
on my JK I ran the winch power cables underneath the air cleaner box and drilled a couple holes in the flange underneath and secured the cable to those holes. The air box is real simple to remove. I then released the 4 tabs on top of the fuse box and lifted it up. I drilled 2 hole underneath it and ran the power cables thru those holes. The holes were in the front inboard corner. of the plastic box that the fuse box sits in. I then ran them back to the solenoid that I had mounted next to the battery on the engine side. There is a big factory wire connector below my solenoid. The wire to the solenoid from the battery is probably no more than 8" long.
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