If you use the "Mobile full page" template to publish your 360 product views in SpotEditor (which you can select on the Publish form) and then use it like this in the iFrame, you can make it work by adjusting the iFrame height depending on screen / browser size via CSS. You probably already have similar CSS styles for other elements on your pages. Let me know if you need help with this.
Do you think this can work?
PS: the other option is to integrate the viewer directly using our APIs / template examples