We use Ubiquiti equipment at work. We frequently run into situations where a building or buildings are on the far side of a rail yard. So far the Ubiquiti devices have solved these issues faster and cheaper than we could do any other way. I was skeptical of using them as we had previously used some alternatives with poor results. I'm happy to report that the Ubiquitis have been reliable and nearly maintenance free.
We have three setups in the ~250' range. All of them use the nanostations. I would recommend looking at an AirMax Nanostation, they are smaller, cheaper, and you will get comparable throughput to a Lightbeam. An additional advantage with the nanostations is they have wider coverage. This has allowed us to reach multiple buildings/antennas from one unit. From your description this might not be of value to you.
We do have one site that uses a Lightbeam. The distance we cover is roughly 400'. The Lightbeam is overkill for this scenario but we had it on hand. The Lightbeam has a more focused antenna, which makes sense given their range rating of 18+ miles. The directional antenna does make them easy to aim. For short distances you can get them pretty close just by "eye-balling" it and then fine tuning with the software.
If you haven't looked at Ubiquiti's online design tools I recommend that you do. They have a few but this one does a good job of showing you potential coverage.
https://ispdesign.ui.com/ You can find your location, select the type of equipment, and simulate its placement including mounting height. You have to change the device type drop down from Auto Product Selection to Manual Product Selection to choose your device.
I'll add that the issues we have had with the Ubiquiti devices have all been cabling related. It is important to use a quality exterior rated cable.