How to install glue up ceiling tiles on ceiling in room that is out of square?

Want to put up 2'x4' Fasade ceiling tiles in a room that is decidedly not square (duly noted after I bought and painted the tiles). See image for dimensions -- ignore the calculations on the side. One long wall is about 2"longer than its parallel wall.

The pattern on the tile is essentially 12" circle motifs, so it will be noticeable if the pattern tapers off along a wall.

Where do I start to minimize the optics of an unsquare room? How do I hide as much as possible whatever the effect will be on perfectly straight, heavily patterned tiles?

The manufacturer is not helpful here -- the instructions on how to size the border tiles (i.e to maximize the number of whole tiles on the ceiling) merely suggest that if my walls are not square I adjust their calculations accordingly.

The tiles I am using can be found here: https://www.lowes.ca/ceiling-tiles/fasade-1-ceiling-tile-panel-common-24-in-x-48-in-actual-24-375-in-x-48-375-in-_12549901.html?af=3632&cse=3632&gclid=Cj0KCQiAi7XQBRDnARIsANeLIevwbBYWsxCVey7lrwjn1l-kqFr9T_A3Y8_sQnfCrw4AGnhAZ3Ml2osaAqOqEALw_wcB&gclsrc=aw.ds