@budryslp When you implement Site Kit and allow Site Kit to insert the AdSense code for you this means you’re using Auto ads on your site. While you can’t customize Auto ads placement positions from within Site Kit there are configuration options from within the AdSense interface. You can also make changes to the amount of ads displayed (ad loads) or select the ad formats used).
If you’d like to know more see the below AdSense Help Articles:
The AdSense Help Center may also be able to assist with any particular AdSense specific queries.
Thanks for using Site Kit and be sure to get in touch if you have any further queries.