Edit added links
Here is an explanation for why it’s most effective on the heart area and it’s often understated when it comes to the Subconscious, our heart’s intelligence
From my experience yes it does work, but ultimately you have the power to have your intention ‘linked’ on / connected to it and you can do what wills you. You don’t need to force yourself to consistently place the sound source on a specific spot but it’s your decision
It also helps to listen to Subconscious Limits Removal & Ego Dissolution & Energy Blockage Removal if you’re looking for more efficiency but there’s many methods to integrate fields
There’s many ways to ‘boost’ the effects and depends on your own energy / physical system and awareness of getting to the origin of things that may affect the efficiency of results