If you play in the middle of the strings, you don’t run into the soundboard with the left hand – there’s plenty of room. The main issue with this very flat harp is stability, but I find a combination of a strap and the lap bar works pretty well. You can also try their backplate – I find it a bit cumbersome, but it works well for some.
One caveat: the harp fits the airline requirements for hand luggage, but the case does NOT – it’s 25 1/2″ high x 18 1/2″ wide. (This is the regular case, I don’t know about the backpack one.) If you check with the airline ahead of time they may be willing to accommodate you, but I’m considering making a bubblewrap sleeve that would stay closer to the harp’s dimensions while still protecting it.