Hey! I’ve used the Montech Air 1000 Lite before, and it’s a pretty spacious case for most ATX power supplies. The L-shaped PSU from Lian Li should fit, but I’d recommend double-checking the dimensions just to be sure, especially if you're planning on running a bigger GPU or want to make sure you have room for cable management. I didn’t run into any issues with my PSU, but I always like to be extra cautious when fitting new components.