I have noticed that there is a progression in the preferred initial staging spot of swarms that issue from my hives. I have a variety of trees around my bee yard. Pine, Fir, Aspen, Elm, Cherry, Red Oak, and Bur Oak.
The first swarms of the year pick the pines, 100% of the time. Later as the season marches on they seem to prefer the Oaks, seldom do they choose another type of tree.
Knowing this, if I had an apiary that did not have trees around it, or few trees, or very tall trees that I didn't want my bees in, I would get a piece of pipe and a Pine bough. Later in the season I would use an oak bough.
I would sink the pipe in the ground and stand the pine bough in it. I would trim the lower 3 feet of the pine bough and leave the needles on the upper 3 feet. After a swarm issued from my hives and set up on the pine bough I would simply take it over to an empty box and shake it in.
I read this tip on here a few years back, but don't recall anyone offering it up recently so I thought I'd recycle it. Of course it is better not to have swarms in the first place, but this tip is cheap and worth a try. Please post here if the staging post tip works.