You do need a plan for every device, but this is usually separate from your quality plan. The device plan is normally documented in a design and development plan that outlines the requirements for that specific product. The quality plan is normally a higher level document that applies to the whole organization and is not specific to one product. The quality plan requirements can be met through your ISO 13485-compliant quality manual, your organizational chart, and other process flow charts. There isn't one section you can point to as the mirror to the FDA quality plan requirement.
