Can I change the button redirect policy for only certain products?

If you want to use a different button redirect policy for a particular product(s); just add one of the following tags to that product from the products section of your Shopify admin zone:

cbb-add-to-cart-button-redirect-to-cart
cbb-add-to-cart-button-redirect-to-product-page
cbb-add-to-cart-button-redirect-to-checkout
cbb-add-to-cart-button-remain-on-page

To add a product tag, simply go to the 'Products' section in your Shopify admin zone:

Then, select a product and go to its '  tags' section:

Add the tag and click on the 'Save' button. 

Please note that Shopify may take a few minutes to make these changes effective. You can watch this Shopify video (starting in minute 7:00) to learn how to add new tags to products.

Note: If you plan to change the button redirect policy on all products belonging to a particular collection, you may want to use the 'Bulk Edit' function on Shopify for faster action. Simply go to 'Products' click on 'More Filters', and then click on 'Collections'.   You must select the collection you want, and select within that collection all of those products you want, then Click on 'Edit products', then click on 'Columns' 'Tags'  and finally, click on the tag section for each product to get it added.