Where would you put a second temperature sender?

Where would you put a second temperature sender?
Not replacing factory, but additional to say a 2005 Neon 4Cyl.

I was gonna say some V8 manifolds had 2 1/8" openings for 2, but don't know thing about those 4 bangers. So here is bump for ya.

the easiest place to access the coolant where it is the hottest & if the 2 paired cyls have ex valves next to each other and if you can easily drill/tap the block near the deck at that point that'd b my choice