Have players joining into an arena, to the spectator spawn. They are invisible and can fly.
Unzip the module files (files tab, "PA Files v*..") into the /pvparena/files folder and install them via
/pa modules install [modname], activate per arena via/pa [arenaname] !tm [modname]
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Add a region of type WATCH if you want to make sure that spectators do not fly out of the arena ;)
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