It is possible, yes.
I've never tested anything at these speeds personally so I can't give you any recommendations. As we discussed the currect, and likely near future, versions of pfSense are restricted by the fact that pf(4) does not multithread. Therefore to get the greatest throughput you need a machine with a high cpu clock speed per core rather than multiple cores at a lower speed. There is very little point in using a 16core xeon server for example.
Edit: The applianceshop hardware looks nice and you are guaranteed that it will all work with pfSense.
Perhaps drop them a line and ask about maximum throughput.
Edit: They state 9.5Gbps in the brochure. But is that for a single connection or the total of many connections?