Those are not "adjustable" in the sense of any great value. Those (and you'd only really need ONE of them) allow you to remove any preload you may have due to inbalanced of the mounts, spring heights, and corner weights.
An "adjustable sway bar" is one that you can change the roll resistance in. That's done by changing the point of attachment of the drop link relative to the bend. Think bars you've seen with three holes in them. Not universally adjustable but it's a start. Three ponts to select frrom with the softest roll resistance being the hole farthest to the end. Race car parts are done with a clamp on slider.
Don't confuse these with a true adjustable bar.
While one might argue you can preload the bar with such a drop link (true) you'll be jacking weight all the time. In one corner it might be what you need, in the other not. And in a straight line if you have to much weight jack it'll effect turn in and braking as one corner is heavy, the other not.
If you have to have one, split a set with a buddy. You can fit one to one side of the car only and back out any preload you have in the bar now. And on a car of 3200lbs or so you can have a lot of load before it's going to make much difference.