Frontline Publishing for Marketing—Does It Work?

Hi community, I’m in the process of getting my book published and looking into marketing services to help promote it. I came across Frontline Publishing, which claims to handle everything from publishing to marketing. It sounds great, but I’ve been burned before by overpromising publishers. Has anyone actually worked with Frontline Publishing for book promotion? Did they help you build your audience, get reviews, or boost Amazon rankings? What specific marketing strategies did they use, and did they deliver real results? I’d really appreciate your honest take—especially if you’ve used their marketing packages or have suggestions on what works best for indie authors. Thanks in advance for your help!