>>23315908
>Hmmm...looks like its just dualwielding two launchers rather than them being mounted
it's a combination of both, they are mounted at the backpack and it can angle up or down, the hand-grip is solely because well, gundam loves it's hand grips. it is almost certainly able to fire without needing to handhold it since that's how it works in the transformed mode anyway, but it'd be pointing upward at somewhere between a 30 to 90 degree angle

I was able to remember some more cannons for you to look at..