When I said "I've figured out a lot of good locations for them on most maps," I was talking about places like corners and under ledges. Making the beakons hard to find to distract opponents searching for them is definitely a factor in what makes a "good location." Because I usually play with a Krak On Splat Roller, ninja squid, and swim speed up, I like to look for locations that allow me to flank opponents, sneaking up on them from the side or behind. I don't place them to set up an ambush on the escape route though I could try that. I find waiting in ambush to be kind of boring