People have run the ZX1500.1 at 1 ohm, but it is technically not a 1 ohm stable amp. Those FI subs are dual 1 or 2 ohm
so he just makes sure he gets the dual 1ohm and runs the amp at 2ohm. nothing wrong there.
edit: nvm, now i see why you posted that. but to the op, if getting that amp just make sure you get the dual 1ohm sub.