No mention of thermoelectric coolers. No fluids or compressor, just a small solid state pelteir. Very little volume used by the pelteir (about the size of a candy bar), so more room for food and drinks. Low cost too. I purchased years ago for my camping truck setup and did not want to go with a refrigerator because 4 wheeling might jostle the compressor too much, also lighter and smaller for the same storage volume. This is the one I have, but they make smaller ones;
Koolatron 12V Electric Cooler/Warmer, 49L (52qt) XL Thermoelectric Car Fridge, Two-Way Design, 12 Volt DC Connection, Plug In Iceless Portable Refrigerator, For Work Travel Vehicle Truck RV, Gray
I added extra rails and a second tray to mine. And don't buy from Amazon, got 2 defective ones there, finally got a perfect one at Walmart of all places.
Works great in my MY, plug into the back low voltage port. Mine is the 16v Tesla and no problems with the voltage. Would never put in subtrunk as it operates by moving heat to the exterior, just like compressor refrigerator, and the hotter it gets outside the more work it has to do. Also hard to access subtrunk when loaded for road trip. Camp mode keeps power ports active when car is sitting.
Downsides are;
-no temp control, it's on or off (although does cold or hot), but it always has nice cold beer.
-not as energy efficient as compressor refrigerator. Mine draws 60 watts (but it's 52 quarts) Keeps everything cold and only occasionally have noticed a little ice forming.
Upsides
-more storage and lighter due to smaller electronics
-solid state electronics, no fluids or moving parts, so rugged
-does hot or cold, just plug in opposite direction.
-more cost effective