A whirlpool bathtub requires two 20A circuits. Can I use a two-pole GFI breaker and a 12/3 cable to power this?
I know there can be problems with GFI and MWBC but I don't think I would have those problems here. Single hard wired device on each branch. If either pops so will the other ... that's fine.
I know a duplex GFI breaker is expensive, but it's a long and torturous cable run so it make sense for me to use a /3 if I can.