As others have pointed out in the forum, setting up an LPR camera takes time. Adjustments must be made for both day and night captures. It is more art then science in many cases.
It is something that is done over a matter of weeks or months to make the proper camera adjustments. As has been suggested by others, mount the camera on a ladder or temporary post. Then make changes to your settings for what is needed at your location for that time of day.
Night settings will be completely different depending on lighting conditions, range, B/W vs color etc. It is not set and forget if you are interested in fine tuning the camera for optimum performance under varying lighting conditions.
Take your time, record your settings and make changes to improve the image as needed.