Hello, thanks for contacting with iToo Software and for your interest in our products.
Non-interactive render modes (as batch render, distributed rendering, backburner or deadline) don't require any type of license. The license is necessary only to edit or render Forest objects interactively on workstations. We mean interactively as using 3sd Max manually by an operator.
So, in this case you would require a single Stand-alone or Network license. You can see the differences between between both types in our Purchase and License FAQ
I suggest the Network license, because it offers more possibilities on a network environment, as the same price.
In case of any further question or doubt please don't hesitate to contact us.