So it will work... I've been playing Zarya lately and started wondering about using her ult on Eichenwalde to drag attackers into the moat right before the castle. But getting the timing right and enough attackers to the right of the payload is extremely difficult. Think I'll be trying the Lijiang Tower one and seeing how well it works in pugs.
/coincidentally that Junkrat could have survived if he'd used his mine probably