Problems with “Add to cart” buttons

Hi, I’ve installed this plugin and it’s working almost perfect for what I want but the problem is that only the “Add to Cart” in the single product page is working any other “Add to Cart” adds the product without any location selected and then if the person concludes the payment only reduces the general stock and not the location I want.
So is it possible to define a default location for every “Add to Cart” button?

Another problem is I use different prices for each location but in the filters I have only the main price works, is it possible for the filter to take into consideration all prices?

Thanks!