We just hooked mine up last week...we put it at about the halfway point in height of the room, attached to a cabinet I have in there so it's close to what the center of the room would be. This way it's not too close to the walls or windows either.
The unit I have reads temp and humidity so it's just one piece in there.
By the way, hello Barbara and welcome to Orchidboard
I'm sure our other members would like to meet you...we have an Introductions forum where you can say hello