Sponsored Products placements

Hi, I am having difficulties with my PPC Campaign regarding placements. The majority of my budget is getting taken by placements on product pages. Is there any way I can fix my placements to just appear on top of search? I am finding that my ACOs is much higher with my products being advertised on other sellers product pages.

Advertising > Campaigns > ‘Click on your Campaign’ > Placements

You can adjust the spend (as a % of your bid) for the different placement types.

From what i understand, doesn’t adjusting this just adjust the amount you are willing to spend per bid e.g amazon will increase you bid by 25% at top of searches rather than adjusting where your budget is actually being spent.