Stas, if you all can't (ever) figure out how to make the W-E1 work (like your competitors have), would it work to us iPad in the field "tethered" via the Apple Lightning to USB3 Camera Adapter? (https://www.amazon.com/gp/product/B01F7KJDIM)

When it works, (most of) Helicon Remote's functionality remains THE BEST ON THE MARKET for complex focus stacking in the field.

However, Stas, the Canon WFT-E7A you mention is horrible. It's $750(USD), large (and no, not practical to screw on the camera bottom - that's where the tripod/plate goes ...