form position

Congratulations on the plugin, just a question. There is how to change the position where it appears the form? I would like him to be just below the field where selecino options (product variable).

I tried changing the value of the hook woocommerce_single_product_summary but when I change the value from 30 to 20 does not display the form.

https://www.ads-software.com/plugins/woocommerce-product-stock-alert/