There's just the one as far as I know,so a collective noun is out of the question. The only individual I can think of right now who might warrant a collective noun is Agent Smith from The Matrix. I think I'd go for, 'a tedium of Agent Smiths'.
(
mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ,
Thu 21 Aug 2014, 3:38,
archived)