I have had a Stormwerkz rail mounted on my M92 with PA micro for several years and it has never lost zero. In fact with nothing more than an RDS the little M92 is able to get pretty consistent hits out to about 300yd with some holdover in my experience - I think the short stiff barrel actually helps with accuracy because it probably flexes very little and you don't lose a whole lot of velocity with 7.62x39. Up close it is a tight shooter.
I guess my only concern would be that if you press sideways against the optic you can see that the dust cover does have a very tiny bit of movement, but hands off and it retains zero. You have to literally grab the optic and pull hard to the side to see any movement so it is very minimal.
I have also seen guys mount an Aimpoint Micro type base just ahead of the rear sight rather than a rail section and with a compatible optic you can get lower cowitness with that. I don't think any type of RDS mounted on the Stormwerkz rail will have cowitness.
TWS also has a fully railed hinged dust cover for the M92/M85
You can also use the Master Mount with the M95/M85 to get a functional side rail.