You didn;t mention the model number or a link to the sale site.
Most mount them on the top of the trailer so the signal has a clear line to the tow vehicle. Works best if there is a light up there to pull power from. If the marker light is left on you can see traffic behind you as well.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6