As soon as I tried Mosko moto Reckless 80 (v.3) on our new 2021 KTM 1290 Super Adventure S, I was impressed with the fit. Shape of the rear end and stand-offs integrated into passenger footpegs are perfect for Reckless 80.
For use with Reckless 80, Perun moto rack should be mounted without stock grab handles, in upper position (Section II - Instructions). Mounted like this, rack sits almost flush with the stock seat.
Since I use Reckless 80 on my 2019 KTM 690 Enduro R too, it is set in position "3". Although it seems that ideal position for 1290 would be "2", bags fit great in position "3" too, so I can swap them between the bikes in no time.
Passenger foot pegs provide decent tie-down point, although there is some room for improvement here.
When bags are placed on the rear seat, like shown on the photo below, weight is centralized and almost entire rear rack is free to accept more luggage.
Also, sides of the bags are fully supported by the stand-offs integrated into passenger footpegs. A bit hard to see, but left side rests on the stand-off...
...and right side is supported by the stand-off and barely touches stock the heat shield. It is not even close to the silencer, but due to the hellish nature of KTM silencers, use of Mosko heat shield is still advisable.
Rear view shows that sides of the Reckless 80 are symmetrical, and silencer is below the bags. And very important - handlebars are wider than the bags, so getting through tight spots shouldn't be a problem.
With very little effort, everything sits nicely and bags are very secure. Nothing flaps around and weight of the full bags is almost not noticeable.
This is an expensive bike and many will go off road. In my experience, Reckless bags are perfect protection for the rear end, much better than any pannier racks, as they act as a cushion pillow and absorb the hit in a case of fall.
And short walkaround video for the end.
It seems like I my old favorite big bike luggage setup is also my new favorite big bike setup.