to use the turrets like sage's slow orb. just toss in a turret, it slows, is destroyed and you can spam the turret like you can spam slow.
now if you say, no you shouldn't compare sage slow to killjoy turret, and therefore i'm wrong to ask for more than 1 turret at a time, then your right. i fully agree with you.
but having played both sage and killjoy and i know how to use the slow from sage, i think otherwise.