Best anti-theft catalytic converter solution for Ford E250 2001?

[JWA]

One possible additional detterance to cat theft is this outfit's under body ultra sonic alarm: https://www.catstrap.net/buy-now

It's "eye" could be mounted above the converter and aimed to "watch" it without too much danger of it being defeated before it sounded a warning.

Perhaps that alone would be a way to stop the thefts? No self-respecting criminal wants an audience!