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Most of the symbol spells have harmful effects, except for Symbol of Mirroring (and Healing). It says that it works "as symbol of death except ... (effect of mirror image)".
For symbol of death, it has rules for attunement which allows you to set certain people or procedures in order to ignore the effects. For symbol of mirroring, what you (as the caster) would really want is to either a) attune certain creatures so that it ONLY works for them, or b) attune everything that is not your party so that it does not work for them.
Is a) the generally acceptable ruling for attunement? I am especially concerned with the ruling for use in PFS, but I am also in a homebrew where it might come up at some point too.
Strictly speaking you would attune it to whatever you are going to fight so that only allies have the beneficial effects.
Homebrew I would allow attuning it to only your allies but PFS you are stuck with playing it as written.