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Usually the sensors are fitted outboard of the centreline, enough that the towball/bracket is not seen.
The two central sensors on my Sedona are same height as tow ball and about 18" apart, never been an issue.
You will need a switch to turn the beep off when you are actually towing. Unless you like the tone when you stick the thing in reverse with a trailer on.
Currently in Dancingdad's garage:
Qashqai 1.6 spark driven, Kia Sedona 2.9 TDI, Scenic II 15DCi 2004 (SORN) not quite RIP.