Is the HyperDrive only supported by the two Thunderbolt 3 USB-C connectors or is it also supported by the bottom surface? How strong are these connectors?

The HyperDrive does not touch the bottom surface, but it is not only supported by the two Thunderbolt 3 USB-C connectors either. The HyperDrive stays flushed with the MacBook Pro so in addition to the two Thunderbolt 3 USB-C input connectors, it is also getting lateral support from the side of the MacBook Pro. We already had a single connector HyperDrive for the 12" MacBook on the market for about a year (https://www.hypershop.com/collections/usb-type-c) and no user had ever complained about any damaged connectors. If you look at our design, any possible stress would be more on the HyperDrive USB-C connectors than on the MacBook Pro itself. The HyperDrive USB-C connectors are anchored, soldered on the PCB board and double reinforced with a ABS plastic and aluminum frame so it can withstand a lot of stress. If you ever break the HyperDrive USB-C connector, it is covered under warranty but to date, nobody has ever complained about a damaged connector on the single connector HyperDrive and this new HyperDrive with 2 connectors is twice as strong.