Get data from post meta

I use ProductFeed elite. It has an MPN value stored in post_meta > _woosea_mpn. I want to show that with the current meta block on the product pages. I'm not very good with this stuff. I've tried a few things but can't get it to work.

So far I have this in a hook element at woocommerce_product_meta_start:

<?php get_post_meta($product->get_id,'_woosea_mpn',true);
echo "MPN: " . $product ;
?>

It doesn't echo the $product. Are you able to tell me what more I need to do or change to get this to show up please?

Once this is working I'd also like to have it show on any product block, archive etc above the button. I suspect I would need to use woocommerce_before_add_to_cart_button or woocommerce_before_add_to_cart_form but I would prefer if you could also clarify that for me please.

Thank you.