Does FlowNerve need to sit on the neck to work?

Yes, FlowNerve Neck Pro should be placed according to the product's instructions on the neck/throat area. Even though the body has nerves everywhere, the product is specifically designed to stimulate the vagus nerve, not nerves in general.

The vagus nerve originates in the brainstem and runs down through the neck to several of the body's internal organs. FlowNerve uses electrical impulses through the skin to stimulate the nerve in this area.

Placing the product on, for example, the arm or leg is therefore not the same thing – doing so stimulates other nerves and does not use the product in the way it was designed for.