Anything made of wood(musical instrument, antique furniture, etc.) will suffer from excessive dryness. No matter what you get, try to keep the harp in a closed off room where you can keep a humidifier going that will keep the humidity between 40% to 60% relative humidity. Even if you are moving the harp out of that controlled environment a lot, for gigs or whatever, returning it to that humidified room will help prevent problems. Harps don’t dry out instantly when they go into a very dry environment. It takes months.
The Utah Symphony owned a Salvi Arianna. We purchased it right after I joined the orchestra in 1999 & owned it for 10 yrs before it suffered a disaster right before a dress rehearsal for Ein Heldenleben by falling off a riser & being totalled 🙁
It held up fine in this climate, it was stored at the hall in a temperature controlled (but NOT humidity controlled) environment, we used it for subscription runouts (before & after we acquired a temperature controlled truck) & even took it on tour to Europe so it was subject to many environment changes. I didn’t experience any problems with inlay or wood cracking.