Define major placements, would you?
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Let's face it, producers who're actually in the industry rarely have time to respond to threads. Lucky for you, I'm here to help answer this question. Are you ready... Placements are placements and nitpicking between working for one person or another can put you in the poor house. Also, regardless of the types of placements a producer gets, selling beats on soundcloud or soundclick is profitable when utilized by the right person. Besides, where's the hidden rule that says you're only allowed to use one or the other? I suggest that you use both so you can reach out to both demographics.
To sum it up, work daily to sell your music, place beats everywhere you can monitor, and promote to your fan base on a regular basis. If you don't have a fan base then your only priority should be developing one. It's difficult to get placements or sell beats if you don't have a fan base, after all. Fans make it possible for us producers to exist; therefore, you'll be force to reach out to them one way or the other.