You need to toe in the pads, so the front of the pad hits the wheel first.
I've done that for the front pads (5p coin between rear of pad and rim) but not rear brakes, both equally noisy...
5p is probably a bit thick, either do it by eye or a bit of folded card is plenty, riding around a bit getting them to squeal as much as possible can sometimes help too.
Use a postmans rubber band - tie a knot in it and then put the loop around the heel edge of the pad. Then install the pad and remove the rubber band
@veLLo started
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You need to toe in the pads, so the front of the pad hits the wheel first.