You need to buy/make an adapter so you can screw on a suppressor. I think Donny FL makes some but they are expensive.
I've bought one but haven't tried it yet, I guess it's possible to hit the suppressor but for that to happen there has to be flex or the suppressor is too long.
https://donnyfl.net/collections/adapters/products/hatsan-blitz-1-2-x-20-adapter You might need to increase the front barrel spring tension or lower/replace it, I've read that a suppressor might make it harder for the Blitz to cycle.
My experience with the Blitz is pretty bad but after some adjustments mine works perfectly now except that the accuracy is garbage.
If the magazine spring tension isn't high enough the probe will clip the magazine. There are guides on how to do so, one method is to drill a hole in the magazine and move the spring anchor to it to get half a rotation of more spring tension or you might just want to turn it an extra revolution.
My Blitz was lubricated using some white paste, I removed it and used a gun oil instead, this sped up the mechanism trough so had to increase magazine spring tension so new rounds would cycle faster. I have a chronograph that can measure shots per minute and if I remember correctly my Blitz fires .25 at 1200 rounds per minute.
As for your original question, I'd only worry if you were going full auto. As mentioned above you might need to increase hammer spring so more air is used if you install a suppressor. How the Blitz works is really simple, there is a rod that goes next to the barrel to the front of the rifle where a plastic air catcher is located. When the rifle is fired the air catcher is forced forwards pulling the rod with it. In the middle of the rifle there is a gear that this mechanic rotates, the gear has a toothed metal part that is forced backwards by the gears rotation, this pushes the charging handle backwards so a new round can cycle.
Really simple and really efficient when it comes to rate of fire as the rifle can fire as fast as the mechanical parts can move.