Marketo Integration Limited to 20 Users - how can this be increased?

We have several hundred Webinar users who would need to integrate their webinar to Marketo but the new Marketo App for Zoom Marketplace states that only 20 users can be added to this according to the note Zoom for Marketo and you can only have one Zoom Launchpoint created.

How can we expand on this number to allow all webinar users access to this??