The USB-C specification[0] recommends a minimum 12.85mm heart-to-heart distance between ports. Fine for cables, probably not fine for dongles. USB-A mandates[0

The USB-C specification[0] recommends a minimum 12.85mm heart-to-heart distance between ports. Fine for cables, probably not fine for dongles. USB-A mandates[0] a maximum overmold size of the plug of 16mm, so the minimum heart-to-heart distance is going to be a hair above that, although I don't think anyone is placing them that tightly together in practice. [0]: https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019_0.pdf#page=136 https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%... [0]: http://www.poweredusb.org/pdf/usb20.pdf#page=127 http://www.poweredusb.org/pdf/usb20.pdf#page=127