3 questions

1) I'd like to connect a second unit to my V1 node using a USB hub. Do I use the USB-C on the side or the USB-A on the back?

2) Is there a limit to the number of units I can connect to a V1?

3) Whats the spec difference of the V1+2, because the V1 is running a on a pi - is the v2 also running on a pi?

Thanks!