Look up tow bars - the adapters that allow you to tow an Element behind an RV. They mount behind the grill, in place of an inner 'bumper'. If it is strong enough to pull the E itself, it should be strong enough to pull something else of comparable weight. I'm assuming you don't have to support any weight, just a horizontal pull.
Blue Ox is one brand that I've looked at. I've seen detailed installation instructions. They use the same model as used for an CRV of similar vintage.