Founder and leader of several Elder care businesses. Certified Geriatric Care Manager. Certified Public Accountant. Software Engineering Manager. Online Marketing and SEO expert specializing in helping get new clients for professionals and companies that serve the elderly and their families.
The answer to that is simple: realistically, you have little or no control over which sites those ads appear on, despite what Google and others tell you. Because of that, you have a very great risk of wasting your money due to "click spam" where the site owners for those display network sites nefariously generate bogus clicks, to earn part of the pay-per-click fee that Google charges. It's a waste of money.