The Prius has a stainless steel shield but none are available for the Accord. As you are aware, the shields are only a deterrent. This picture was just posted in a tech group last week:
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Aftermarket is available for the Accord, but not for the Prius.
MSRP for the parts alone is over $2500 for the Prius. Accord is over $3K for dealer parts.
I wonder if a person could conceal some wires on top of that shield that, when cut, would activate a really loud alarm aimed under the car.
Or some heavy gauge cables that would deliver a powerful charge when cut?