What are the dimensions?
Any cooler that has air forced through it by a fan is better than a cooler that relies on your vehicle moving to force air through it.
When you are working the strg the hardest, usually slow moving between the rocks on a trail you are moving 1mph or less...very little air is moving thru the cooler.
Put it in front of the radiator for max cooling. Don't be afraid of "fake news"

that says it will make your engine overheat by blocking the radiator.
Check any new car/truck and there are a variety of coolers almost blocking the radiator and they still cool with a properly designed cooling system.