Hey there, Lucas! Thanks for getting in touch and checking out the plugins. π
Great question. Technically, you only need a single license for a multisite installation since the license key is only added to the main network admin.
It’s sort of the honor system, but we’d prefer it if you purchased the license that matches the number of sites you will be managing–the number of sites you maintain with the plugins reflects the level of support you may be needing and helps us provide better support for you. π
Does that help answer your question? Please let me know.
Cheers!
Geoff