I think this article covers inappropriate urination quite extensively:
What You Should Know about Inappropriate Urination in Cats
Inappropriate urination, or urinating in unacceptable places, can be one of the most frustrating feline behavioral problems that many cat owners may have to deal...
Vets have contradicting personal opinions too i am afraid. Most vets will not advice you some food because they get paid for it, mostly it'll be just their personal experience and preference (and yes, sometimes they can get brainwashed by manufacturer's sales reps too)
As to the statement that...
