They are so inaccurate I would just install one of them for an overall inside case temp and set up fan profiles.
How inaccurate are they?
I have one on my cpu backplate that never goes above 25.c and one on my gpu heatpipe that never goes above 35.c.
I now just use auto for general browsing as the fans are kept low and manual for gaming with the fans set to give good cooling but not too loud.