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Pick on the cable you are running and the continuous draw, not on the biggest number in the range. Fitting 80A where the wiring only suits 70A leaves the cable unprotected at the top of its range. Size the cable first, with 6 B&S as the floor here, then choose.
Because a tripped breaker is a button press and a blown fuse is a trip to town. On a remote run that matters. The trade-off is that a resettable device invites you to reset it twice without finding the fault, and then you are just annoying the short circuit.
Yes, orientation does not bother it. What does bother it is heat and vibration: keep it away from exhaust and turbo plumbing, mount the base on something solid rather than a flexing panel, and leave enough room to get a spanner on the studs without shorting across them.

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