I have seen circuits where it is connected across the switch (relay or triac) and others where it is connected across the Load.The snubber needs to be rated for a current greater than the switched current and it's reverse breakdown voltage must be greater than the voltage being switched.
Don't know what you mean by live/neutral in this context. The snubber needs to be placed such that it limits the back EMF generated by the inductive load and seen by the switch.
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