Hi there, Ben! Thanks for getting in touch.
Yeah, you should be good there. The Personal License is good for support on a single site and that should ring true for the plugin being installed on the same site in multiple directories.
The one issue you may run into is the License Key only being accepted by one of the installations. The functionality of the plugin will not be affected by this, but it will prevent automatic updates on the installation without the License Key. Everything else will work as billed, though.
Does this help answer your question? Please let me know. 🙂
Cheers!
Geoff