Laptop USB video extenders

Looking to get a couple of USB video extenders for my laptop for my HOG3PC system to drive two 15" touch screens.

Does anyone have any experience with these? Will the touch screens work ok through these?

Here is what I want active at the same time - no mirroring - all screens are extended:
- two external touch screen monitors
- laptop display

The laptop has limited # of USB ports so I would need to run through a powered USB hub as well.
- two USB video extenders
- two USB touch screens
- HOG widget
- HOG playback wing (has one spare USB port)
- HOG programming wing (has one spare USB port)

On the laptop:
- USB mouse
- USB Hub

Does anyone see any issues? Any recommendations on USB video extenders?

Thanks,
Ross
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