It was the Wehr sniper I had in mind. I doesnt play as SU. Sorry :>
I know there is something called like a sniper bunker also. Kind of simpel and probaly hated by many. In your defensive line (mgs, anti tank birbed wire and all that.) In the middle of that. Take the strongest building and put like.. 6-7 snipers in there XD If you cant put all the snipers in the same building. Split the sniper army upp in buildings close by so they at least have the same fire view .
It cost like a minor country and takes a lot of time and mortars/arty easily take them out but. What you get is a rapid fire sniper fotress. I think there is a video of it.
Super SniperThis is a bug so there is only one sniper firing all these shoots XD.
But the effect is close. A sniper machinegun :D Because when one of the snipers shoot and then has his cooldown. the other one shoots :D
Sometimes they shoot the same guy however . You can also always have the sniper army out in the open behind walls and such in camo mode and on hold fire. And when the enemy advances through your line. Select them all and open fire :D

My English is kind of useless. But that because Iam swedish Wooohoooj! ;3