Getting 5 workspaces to test your Slack app

Just generally curious what are best practices here since its difficult to find testers.

I have been recently making a simple bot we just used on our workspace production ready-ish and went through the submitting process to the slack store - Last thing (and blocker) before submitting is to have 5 workspaces dowload it. I have 3 users already using it and it goes well but the problem is that if we can to bring more traffic and feedback we need to submit it to the marketplace.

Anyone dealing with this exact same problem? How did you handle it in the past?

Any advice is more than welcome! Best!