Last year was my first go with swarm traps. I had 100% loss over the preceding winter, my fault, lessons learned. I ordered 3 nucs to start over and while I waited on them I built and set out 10 traps around my property, the neighbors land and on some friends farms the first week of April. The 1st 2 swarms settled, on one on my place and one on the neighbors. within a week. Fairly certain they came from feral hives as there are no beeks close to me that I know of. got another from one on a friends farm in late May. 23rd of June I had rotator cuff surgery, two days later neighbor tells me the other trap on his place had bees and I then find the trap I had placed 30' from my hives had bees. The last two I caught close to home could have been either swarms from my hives or more from local feral hives. My guess is the one in the close trap was a swarm out of one of my hives. In total I had caught 5 swarms. I don't see any harm in putting a trap close to your bee yard.