I’ve got a couple TrueNAS systems that I’ve built. Both have twelve drives, one with 12TB drives and the other with 14TB drives. One is a large case, the other is a Dell T620. Both of the systems have dual 2.8 GHZ 10 core / 20 thread processors so I can also run virtual machines on them.
Be careful once you start down this rabbit hole. Next thing you know, your computer hardware seems to multiply all by itself.
I think the bigger issue is that all the bits on your network will be backwards because you’ll be in the southern hemisphere. I believe you can get hardware to correct for this, but it’s probably expensive. A software solution may exist and be far cheaper. It may be better to buy computer equipment there and only transfer the data that you need.