How do I allow anonymous posting in Slack?

The anonymous posting application called Abot is approved for use and can be installed by the teaching team: Add apps to your Slack workspace | Slack. Abot provides a week long trial period after which it must be paid for by the teaching team.

The Poll Everywhere application is free for use and provides a feature that can enable students to post anonymous questions in response to a post.

After installing the app, typing "/pollev" into the channel will bring up a multiple choice question or an open Q&A prompt, the latter of which you can set for anonymous responses.

It would look like this:

The student would click "Respond" bringing up this dialogue screen:

Then in Slack the anonymous responses would look like this: