Hey, I’d recommend checking the dimensions of the L-shaped PSU and comparing them to the space in your Montech Air 1000 Lite. I’ve used similar cases before, and the size can be a bit tight with some non-standard PSUs, especially when it comes to cable management. If the L-shape is a little larger than the usual ATX PSU, it might not fit perfectly, or you might have to tweak the cables to make everything work.