First, Did it make the improvement you expected?

Where did you physically mount the relay, in front of the Rad support or behind (this is my main question) and why?

What size wire did you run to power the relay and where did you run it from? ( I have a trunk mounted battery)

My application is a daily driver driven in tropical south Fla near the coast and I am wondering if I am asking for future connection problems, etc putting a relay in the very front exposed to highway driven rain, dirt, etc

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.