It might work but I'm not 100% sure.
One thing is quite certain I think is that you will need to use an externally powered USB hub, one that will provide the standard 500mA *per port*, rather than a non powered one that will pull 500mA from the PC and share it among its downstream ports. These cameras are relatively power hungry.
If you select the MJPEG stream type in the settings the camera will compress the stream on its side and the bandwidth may be manageable. In this case Kinovea won't recompress it before storing so it's the most streamlined scenario. If the limiting factor is the I/O bandwidth at the drive, another trick would be to set the output files to automatically record one camera to the SSD and the other to the internal HDD.
Two C920 recording to an internal SSD via USB 2.0 works in Kinovea but it's already a scenario that requires the right USB setup.
If you have enough RAM on the laptop another trick could be to setup a RAM drive. It's like having a drive backed up by memory, so lower latency and greater bandwidth. I've never tried that myself but in theory it should give the maximum performances. It will compete with the size of the delay buffer if you want to use the live delay feature though, and you have to remember to copy the files over to your main drive before shutting off otherwise they are lost.
