They are more like the size of the interrogation droid that Leia saw.
Chion and Kuylen have forced theirnway through to the centre of the room, demolising many of the spheres as they go, and now fight (roughly!) back to back.
The tide is turning in this one, just keep up the pressure, guys...
Rex, you have six guards to worry about, and Dexx, five spheres spin quickly and fire at you.
Three randomly thrown detonatorsd would just blow up the same bit of room! Logic dicates you space the two detonators that Kuylen specified evenly so the blasts cover the room.
As I said in the survival thread, you have to remember how these things will look to others. If you pile on more detonators than needed then everyone will guess that this was a distraction, rather than the deliberate destruction of the stores you want it to be.
BTW, the drives you need are pretty large. Did anyone think about how to move them, because there is no obvious equipment around for doing so!
(Hopefully this raid will be a lesson in foresight...)