Do suit/weapon modification stack?

I've found a topic with the same title from 2021, unanswered. Didn't want to necro it.
Can I apply Quieter Footsteps 3 times to sprint silently like a ninja? How about Melee Damage? Or a few Stowed Reloadings for continuous shooting?
It would be fun to specialize in something that way. Do the upgrades stack?
 
Thanks, all! Welp! Time to make it a suggestion.

Edit: It's here:
 
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