That cable reminds me of a vegan diet--pretty much eveything you can do to make i difficult. Add up all the pieces and you get almost 10awg which is what I recommend. It will be a lot of extra work to get all the conductors stripped and ready to go into the connectors but it is pretty simple. Put the red cable and black cable in the hot pins and the green to the neutral. The connectors are probably marked.
Make sure you tighten each conductor well and secure the strain relief. Let us know how you like the viborg. I haven't seen anything to make me think they are better than other Chinese connectors other than they gave them a name.
Jerry