I always set up with the sun on the landing boards at midday,
If there's a beetle bank its best to set up on that as its out of the firing line.
Water is the next concern some places can be like a desert in summer and a boating lake in winter.
I also look for a sheltered spot at the edge of a copse of trees.
Being exposed at the top of a field is not much fun for beekeeper or bees. ...
Perhaps an example
In Turriff a friend of mine had set up his out apiary in a walled garden over the fence from the field of OSR most of the crop was up hill, in the mean time I set up a string of nine at the top of the hill fir trees to one side but turned out to be a bit desolate. There were also deer issues as well which only came apparent after the hives had been knocked about a bit... deer were caught in the act.
We had a combined demonstration running for the Aberdeen & district beekeepers association over 2 days we would split the group into 2 and I'd take one half Steven took the other Saturday went well but Sunday was windy. Stevens bees were flying non stop but my lot were hunkered down. We had a good demo at Stevens site. I still had a hive to split as there were Q cells ready for splitting and the Job wouldn't wait so in the end we had to back the car right upto the hive and wait for the wind to die down enough for a quick raid this was done and we had a good split both halves did well.
So picking the site is important from exposure as well,if you can find a wall to hide behind its better.
Vehicle access is important as well, but less of an issue if you have help
I always try to learn from my mistakes and keep a note of sites I've used in the past what worked what didn't