TT: No hook on the front plug. On a wee tad, the hook and plug come separate, just run your line through the hole provided with a bead stopper below the top plug.
For bigger rigs (chasing salmon), you can use the 3" tomic out front with the same or larger plug trailing. Some larger plugs come with a separate hook on a swivel much like the wee tads, but if not, you can modify the front plug by removing the wire that passes through the plug, this will leave a hole to pass the line through. Of course, you won't be able to tie a mainline or hooks directly to this plug anymore. You might want to consider searching swap and shops for old plugs so that you're not tearing apart a $10.00 plug for something that you are modifying. Also, with all the prism tapes etc. available on the market these days, color won't be an issue when buying old plugs to modify, just whether or not they track properly.
They look rather cool in the water, make sure that you run them just far enough apart so that each plug supplies it's own action. You don't want the large rear plug dictating what the front plug is doing, yet they have to be close enough together, so that they look as if the larger is chasing the smaller.
Yote: I don't know if I've ever had anything hit the top plug (probably did, but can't say for sure) and don't really see any reason why they wouldn't hit it. It's all bait, right.
Seafood, it eat, then catch more.