I worked for a while for Company A, which was founded by a team that included senior engineers and senior management from larger company B, licensed technology from B, did critical contract work for B, and at one point was supposed to become the primary manufacturer of B's products.
Company A shut down. My resumé went into company B's HR department, never to be heard from again. Eventually I had to pull a string that led to B's senior management. Suddenly an interview process was setup.
I get there, and the first words out of the HR drone's mouth when we sat down, with a deeply confused look on her face, were "What's Company A?". She'd just suffered severe whiplash when a directive from on high had told her that she would be setting up an interview for a candidate she'd ignored. She wasn't new, she'd been there over two years.
Everyone involved in my hiring except her knew what A was, who I was, and why I was there. The interview process was little more than a check for whether I annoyed the hell out of the people I'd have to work with or not. I was being handed to B on a silver platter, a pre-vetted, pre-trained, instantly-productive candidate. The most senior technical person who interviewed me walked into the room, sat down, and said "I really don't have anything to ask you".
If you insist on using recruiters, do not put them in HR. Embed them with the departments they're hiring for, where they might actually learn something about the work the company does and what it needs.