A useful multi-cat layout distributes appealing resources and avoids forcing cats through a single narrow route to reach them. Start by drawing a simple room plan showing doors, walkways, favourite windows and existing resting places. Mark where each cat spends time, rather than assuming every animal wants the busiest family room. Put additional resting and scratching options where they offer a genuine alternative. Two beds touching each other may still function as one contested location.
With a large tower, consider the route both up and down, the space around its base and whether a passing cat could block another inside a den. Keep essential items accessible without requiring a climb. Review the arrangement at different times of day, including when people are home and doors are closed. A practical layout gives cats opportunities to approach, retreat and rest without repeatedly encountering an unwilling housemate.
Try marking each cat's usual daytime and evening locations in different colours on your room plan. Put the next resting place where it creates a new option, rather than adding another symbol to the busiest existing cluster.
For product comparisons alongside this advice, see Ultimate PawHouse and Taj-MeowHall. The details below explain their sizes and uses.
Further reading: cats.org.uk; cats.org.uk.
Ultimate PawHouse
Taj-MeowHall
Cat-Cave