You can specify the Hop Link target as any URL you wish, even set all your Hop Links to the same URL (such as your main shop page).
In fact, very soon we will be enacting a slight change to the way Hop Links work, so that the 6-month cookie we set in the buyer's browser for following a Hop Link would track commissions for all products you have set with an Affiliate percentage, whether those other products have their own Hop Link enabled or not. This will help make things as simple as possible for your Affiliates, as you would only need to enable the Hop Link for one product (even a dummy product named something obvious like "Affiliate Link"), and then just configure the Affiliate share percentage for any/all other products as you wish. Affiliates would then have only one link to choose from, which tracks their commission for sales of all Affiliate-eligible products.