The sights you linked won't work with a magnified optic. You can not co-witness with a magnified optic like you can a Red Dot sight or Holo sight. So fixed backup sights are a no go. You can have a fixed sight in the front and you won't really see it unless you're on a lower power magnification then you might get some shadow. A fixed back sight will get in the way of the scope. You'd have to run a flip up back sight and since you don't have a fixed sight on the front I'd run a flip up sight up front as well, no need in a fixed sight up front if you don't already have the A2 sight aperture up there.
Also, I haven't looked at them in a while, but if the mount isn't a QD mount there is no need in even spending money on BUIS because you'll never be able to use them. If your optic went down you wouldn't be able to remove the optic and mount to even flip the back sight up so it would be useless. Save the money and put it towards a trigger.
The offset sights that BigPig linked in the picture would be the right direction if you just had to have BUIS, but the offset sights add bulk to the gun and they will snag up on almost anything. If you plan on using this gun for hunting and you're walking through brush and weeds, it will be snagtastic for sure.
Here is one of my guns with BUIS, you can see the back sight sits under the magnified optic. My mount is a Larue SPR-E with the QD levers so it takes all of 2 seconds to get off if need be. Then I could flip up the sights and use the irons. Would this ever happen? I seriously doubt it, but its my SHTF gun and have them there just in case. I don't run BUIS on any of my other guns, this is the only one.