Consider the plants as a separate safety decision before placing a cat tree beside them. A new climbing perch may give your cat access to leaves, pots or water that were previously out of reach.
Check every plant's identity and cat safety using a reliable veterinary or animal-welfare source, and remove unsuitable plants from the area. Do not assume that a plant is safe because your cat has ignored it at floor level. Also assess whether a pot could fall onto the tree or whether the cat might jump into unstable foliage. Keep watering products and fertilisers inaccessible. From a layout perspective, leave space for the flower bed and its access route without branches intruding. Decorative harmony is not worth creating a new route to a plant or container that should remain beyond your cat's reach.
Keep true lilies out of a cat's home: Cats Protection warns that even small exposures can be serious, including pollen groomed from fur. Suspected contact or ingestion needs immediate veterinary advice rather than waiting for symptoms.
For product comparisons alongside this advice, see Floral Canopy and Arbor Retreat. The details below explain their sizes and uses.
Further reading: cats.org.uk; cats.org.uk.
Additional sources: www.cats.org.uk, www.pdsa.org.uk
Floral Canopy
Arbor Retreat
Linden wooden cat tower