I am not a big fan of dps meters, but having something to measure your TTK (Time-To-Kill) is a great way, so doing thise via the trainigns dummy is a great way.
I suggested this in several other posts already.
Marvel Heroes had 3 different Dummies, that had different amounts of fixed HP.
This way you could measure for burst dps and sustained dps.
The lowest dummy usually was not a good reference point since you killed it in like a few seconds.
The medium one had hp, that needed like 10-20 seconds to kill and the highest one, you needed like 2-3 minutes to kill on average.
This was a great way of comparing yourself or a different variation of your build to see if you are roughly in the same ballpark, without having exact “DPS” numbers.
I just have very negative experience with any accurate dps meter in MP games, since it does cause a lot of toxicity.