だれにも + passive verb

Question

誰にも怪しまれずに動き回れた

Does 怪しまれず take the に in 誰にも or has the second に after も been omitted because it can not be used after も?

Answer 1

誰にも怪しまれずに動き回れた
(He) was able to move around without being suspected by anyone.

This is 誰も (anyone) + に. So the に is the 'by' part used in the passive voice, as you suspected. There is no need for an additional に.

So why is it だれにも rather than だれもに?　It turns out that the particle も likes to move to the right. I once asked a similar question here .