I decided to run around with 11/5 in Cold War for the first time in over a year and I tried out a shock Mining Laser with it. As long as I could hit all three beams on target, it appeared to have about a 50% chance to freeze the enemy.
Normally, after applying a DoT to an enemy and not freezing him with it, you would have to wait for the DoT to wear off to get another chance to proc Cold War. To me, it seemed that as long as you can apply multiple DoTs at the same time, you could bypass this rule.
With a regular railgun, you would have a 40% chance for a DoT which would translate to a 22% to freeze with 11/5 in Cold War. The Mining Laser also has the 40% beam but it fires out three of them at the same time. So you have three chances to apply a DoT at the same time and because of that, you have a triple chance to freeze.
I could be wrong though. Maybe I just got lucky with the procs while I was testing all of this.