Just drove for 30ish minutes, and I found the spot you are talking about. It has a black metal painted cover in mine, but there is some exposed silver metal and it actually burned me it was so hot! Wonder if it's part of the drivetrain?I’ve experienced the same exact thing while driving with just the windows down. I reached down towards the gas pedal and felt an exposed metal piece next to my right foot towards the center of the car and it was hot to the touch.
I'll paste a picture I took for others to see the spot. Also, not sure what to do about the rust forming down there