I've been really struggling on Xbox Series X with the Modern Luxe curtain and poles too and then the Desert Luxe after that on the same house with tall walls and 4 different Discover University medium sized windows. I first couldn't line up the Modern Luxe ones, even with MOO on. The pole was snapping a fraction higher and even with free placement and MOO I couldn't stop it snapping to the wrong spot. I spent about half an hour then in frustration I switched to the Desert Luxe curtains. The tall size worked fine which was a relief but then I needed to place the medium ones over small windows on a platform because of the space and the pole wouldn't line up. Eventually after a long time I got it to work but with Repetitive Strain Injury my poor wrists were so painful. I probably should have just given up but I was determined it had to work.
I'll try the workaround suggested here tomorrow. I had problems with a short wall with and without a platform too on my other build and managed to get an image but it's just of the Modern Luxe and not the Desert Luxe. It still shows the issue though. Both kits have a similar issue. I haven't had a problem before with the Desert Luxe ones before now, I thought they were fine but they weren't today. Sometimes I can get it to work by shrinking them and using half grid snapping for the pole then free placement for the curtain but it's really frustrating.