The "bulk" approach works, as does mostly any strategy for getting deals in wholesaling. It really comes down to how you want to operate.
As for hiring the same agent that's representing the seller you're offering to... well, it probably depends on which state you're operating in. For North Carolina, the agent becomes a dual agent, which is a fancy term for a paper pusher with a sock in their mouth. They can't negotiate for either party or offer real estate advice, among many other things. And that might be even trickier to pull off, being that the Seller is already a client of the listing agent, and would have to agree to taking less representation than they previously had with their agent.
The better approach might be to partner with a local agent who can represent you solely, and have them submit offers on your behalf and negotiate with the cross agent. That way you have the full representation of your own agent and you're not dipping your toes into any gray areas.
But to be honest, as a wholesaler myself, I can tell you there are a multitude of much better sources for deals than blasting offers to listed homes. Yes, it does work. But there's better ways.
