Just FYI, whether it's 0F with no wind or 0F with 30mph wind, the vehicle will still be at 0F under both circumstances. Wind Chill only matters to people, not machines.
But to the question, when I lived in Maine I used a heater that was held magnetically to the bottom of the oil pan. It worked like a charm, should be well protected by the LC's skid plates, and is easy to install. Mine was similar to this:
https://www.amazon.com/Kats-1160-300-Watt-Handi-Heat-Magnetic/dp/B000I8YOR4?tag=ihco-20
HTH
Maybe I was lucky, but...
-Even my higher-mileage 100 series..at 16 degrees below zero...with a NEAR-FAILING starter...gallon of milk frozen SOLID as stone overnight in a cooler...??
-The thing started right up on the first crank in this dead-of-Winter BLIZZARD in 2007:
Apparently, no engine heater needed.
Maybe in Fairbanks, Alaska and 60 below? I don't know...but this was a 1999 with a failing starter and 180k miles. -No problem.