For Drones I find it works best to hold CTRL, then click and drag over the drones you want to target. You will start targeting anything within the drag area, so you’ll catch all of the drones at once.
I use the ctrl key most of the time except when I’m active in TS. If I’m active in TS I’ll use the lock target button because my push to talk key is ctrl so it gets annoying for those in TS with me. (Tried to change it, but I’ve had that set as my PPT key for years; even as far back as ventrillio days; so it’s hard to change it).
Most often: Ctrl-click in the overview
Occasionally (when targetting rats in missions and I can keep track of a whole group): Ctrl-drag in space to select multiple targets, as above.