When you say drop ceiling do you mean t-bar tracks and the fibreboard panels? Toggle bolts are as good as you'll get without screwing something solid I guess but I think they are meant for drywall mostly and not the 2x4 ceiling panels. I'd be worried about the fibrous material weakening over time with the moisture too.
If it is the track ceiling those tracks are mounted into the bottom of the wooden joists with big screws/lag bolts. No reason you couldn't still mount into real wood and feed your wire through the panels.
If it's a different type of ceiling than what I have in mind ignore me!
Those fixtures are works of art man...congrats!
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