I have some slope at my run .... nothing crazy. For my uneven parts, I was able to cut the apron and either overlap the cuts or add an extra piece to fill in what got opened by the cut.That's the best bet.
No need to bury wire, do mongoose dig?
A permanent apron can work fine, might have to bury partially where ground is uneven.
Good examples of anti-dig apron installation.
https://www.backyardchickens.com/threads/wire-around-coop.1110498/#post-17093528
https://www.backyardchickens.com/threads/new-coop-project.1169916/page-2#post-18481208
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