I can work with this. Do you have the plank yet? If you do, please share a pic of it so I can see all 4 sides of the locking system. Just a pic of the the finished side of the plank showing all 4 sides.
Attached are some pics of that area, which are closets. (Sorry about the mess, the unit I’m working on is completely empty, but it is identical). I also got rid of the measurements on my drawing, so you can picture those closets a little better. I put a compass star on there in green, just so we can avoid confusion. I like the idea of running the planks East to West
The underlayment is 1/2″ particle board over plywood subfloor.
How tight to the walls would you recommend I put the Quiet Walk underlayment?