Best practices for running e2e tests against deployed app?

[Joe Nolan]

We have a build plan with a final stage of deploying to a server.
I'd like to run some automated e2e (end-to-end) UI tests against that deployed server after the deployment completes (using Cypress test platform).
(Also, I would like to avoid having e2e test failures result in a failed plan, especially as we're learning to write non-flaky tests.)
Can anyone suggest resources on best practices in Bamboo for running automated UI tests post-deployment? I've found very little info thus far.
Maybe "child plans" are the right mechanism?
Searching for "e2e" in this Bamboo forum turns up nothing, which seems surprising.
p.s.
I found a Bamboo plugin called "After Deployment Trigger for Bamboo", but there is little documentation or discussion of how to use it.