I have a friend with a Starcraft deep-V, circa 1975, with twin-20’s on it. It’s the only boat I’ve ever seen with that configuration.
Twin motors are very uncommon in SE Minnesota/NE Iowa. There are disadvantages to having two motors, cost being the most obvious; not to mention the inefficiency – one 250 will outrun two 125’s; think about having to cast and work fish around two outboards; plumbing for gas/throttle/etc; and the list goes on.
The only thing that would justify it (and the reason you don’t see it around here IMO) is if you’re fishing big waters – big enough that it’s better to limp home with one broken motor than to die at sea.