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Another option with inserting your own hook.

It's terribly simple. Just understand it.
Open up ./themes/classic/templates/catalog/product.tpl

1. find

{block name='product_add_to_cart'}
	{include file='catalog/_partials/product-add-to-cart.tpl'}
{/block}

 

2. add after your block or hook

{block name='my_module'}
	{hook h='myCustomDisplayButton' id_product=$product.id}
{/block}

 

3. edit your module and add your hook

a) edit install function

public function install() 
{ 
	$this->registerHook('myCustomDisplayButton');
....
....
....

b) edit uninstall function

public function uninstall() 
{ 
	$this->unregisterHook('myCustomDisplayButton');
....
....
....

c) add your hook function

public function hookMyCustomDisplayButton($params)
{
    $idProduct = $params;
	return '<hr><div style="display:block; width:100%;"><div class="btn  btn-primary" style="my-button">Hello Word !</div></div>';
}

 

4. register your hook

 - admin => design => positions

and click to Transplant a module button

 

5. find your module

 

6. select your new HOOK

 

Result: