Scott_s, that's right. We use the piercing of the ear. But we are also working on a clip-on version for those who don't have pierced ears. Also, as you said, the speaker reaches unto the ear canal (which helps support the speaker somewhat as well.)
You might consider variants that use a conch piercing or a stretched earlobe piercing instead - I'm pretty sure, among the earring wearers of the affluent world, far more have stretched earlobes than have unpierced earlobes, and probably also more have conch piercings.
Conch piercing will likely be an easy adaptation, but the stretched earlobe variant sounds daunting. An interesting design challenge for sure.