Don’t let the ocd kick in, it’s no big deal.
Yes, I wish my engine bay looked perfect, but thru the years I had some unsightly corrosion on the heat shield.
Bothered me at first, but I come to accept it.
But the rogue still runs great after over a decade.
I did recently painted a portion of it black to make it look better though.
Some rogues look unsightly with a lot of rust on the underbody.
My new front rotors got rust corrosion that I am slowly accepting in addition to haven’t new wheels on stand by that will cover them anyway.
It is what it is, on top of Nissan lowering craftsmanship in recent years, this is the least of your problems.
I wouldn’t be too worried about it, honestly.
After your first dent by some uncaring douchebag at a parking lot, you will not care about a little corrosion.