Fears around scaling rapidly and how to do it right

Yes. But your options are determined by the countries in which you need to manage payroll.

The integration conversation may be slightly more complex if the payroll and HR solutions in question are both standalone from NetSuite. This is purely because it introduces a third consideration for mapping.

As standard, ZonePayroll records all relevant data and produces everything you need to fulfill your legal requirements with the CRA, CPA and other bodies.