Stephen, first and foremost welcome to the forum.
Your question on attachment points is appropriate and in most cases tends to drive sling selection.
I fully agree that a two point sling is the best choice over a single point or three point for the applications you described above. That said the real issue is how the gun hangs, the ability to immediately mount the gun and the flexibility to transition the weapon out of the way as you do other tasks. Using typical shotgun or rifle mounting point your gun, when hanging across your chest, it will tend to flop over or even hang upside down. For tactical use I found it best to have the rear attachment point on top of the stock. Many use paracord but given the hollow stock you can actually insert a hard mounting point. This mounting point assure the weapon is easily transition to your shooting position plus it allows you to swing the gun behind your back to facilitate other tasks.
The front mounting point really depends on what other accessories, like a weapons light, your plan to mount, it's location and if you're either a right handed or left handed shooter. That said, no matter the mounting point it should facilitate transitioning from strong side to weak side operations depending on the tactical situation.
There are a number of aftermarket front sling attachment mounts. Many of us use ones from GG&G but you should look across the board.
Guess the bottomline recommendation is focus on how you're going to use the gun, what accessories you plan to mount, the best way to carry it for tactical operations, and where are the best mounting points. Paracord is cheap and you can mockup several configurations to see which one works best for you. Once you've sorted all this out then try a couple of cheap slings to see how they actually operate. If at that point you want to move to a highend sling it's much easier to select the right one.
Edit: The other issue is sound. Many of these newer sling have attachment clips that bang against the weapon and make noise. If you select one of these there are methods to make them silent including ranger bands.
There was a recent threat that discussed many simular aspects. You might search the forum.
Regards