If you place a sensor in a very hot location...ie the intake manifold, it can do nothing but register heat whether it is a true reflection of the actual charge air temp or not.
Mostly a problem after stopped, slow moving traffic etc etc where it can register very high temps.

But given the low time air spends in the manifold, it will not be too adversely affected by the hot manifold/engine itself.

Just install the sensor in the charge piping prior to the throttle, after any charge coolers, and ideally away from any other heat sources.

Although sensors are cheap, if you really wanted you could throw a couple on to test various locations.