Hello
most DAW software do not allow multiple FW drivers for different devices to run together, unless some kind of "aggregation" function is provided. This is available in ProTools and Logic. So it may be a problem to run your 2 devices together on FW. Referring to Nuendo and Prism Sound or any Pro Audio forum on the internet may be a very useful thing to do.
Your other option is to use the H8000 via AES/EBU or ADAT, which are both excellent ways to work with, as they do not put any load on your computer hardware and software.
all the best
I
