Hi Guy,
Thanks for reaching out–great question! If you’ll only be using our plugins on a handful of sites within a multisite network, you can certainly select one of our single-site license tiers and simply install and activate your plugins on each sub-site as needed. However, it’s worth noting that on multisite networks, only our Multisite license tier include additional multisite features such as network activation and automatic updates. You can learn more about our Multisite licenses and how to select the best option for your site setup on our Knowledgebase here:
https://theeventscalendar.com/knowledgebase/multisite-license/
I hope that helps! 🙂 Thanks again, and let us know if you should have any other questions!