I can use XMRig.com or even XMR-Stak to mine with multiple GPU's right? I prefer Arch Linux/Ubuntu but does Hive OS take any fees?
Neary all of them take fees, because they either run a server for remote management, automatically tune your GPUs, or both, or more, YMMV.
Don't mine XMR with GPUs, it's better with CPUs, mine something else with the GPUs.