I think you're right John, Fry are especially vulnerable. Although Diane should be able to attest to that with the fry in her pond.
To answer the question at hand, it is my undersatnding that you would need a pond or fair sized area of water, like a wading pool if you don't want to commit to a pond, to breed the dragonflies. The nymphs live soley in the water until they mature. Otherwise, you'll just have to hope they come to visit your garden.
The drawback to a pool of stagnant water, however, is that the mosquitoes will also take advantage of this breeding ground.