Everytime this idea comes up, I can’t imagine a laser powerful enough to kill even small insects not running the risk of collateral damage, burning things around it.
I don't see how a laser can have enough power density to kill a mosquito but still be eye safe.
(1) Targeting the wrong thing.
(2) Even if the targeting is correct, missing by a small amount, or running the laser for slightly too long, and hitting something else by mistake.
If the lasers converge for full flux, the risks associated with (2) are better managed, but that doesn't speak to (1).
If the assumption isn't correct, you could possibly still place at least two lasers and define a narrow zone between them where the angle would be about 180 degrees. Would be damned tough to hit an eye from two sides at once. But that limits you to half power per laser, which probably isn't enough margin.
Still an issue, though, but not so bad