I post this suggestion here even if it isn’t the exact category just because there isn’t a general game advice section.
In my honest opinion it would be much better and fair if you were able to see proxy mines in every situation (for example when going up to stairs,climbing stairs or near the “blind”/dark spots).
They should appear like glaring red lights, sort of how they should look with Bomb Squad loadout if not even better.
To avoid the problem of having to remove that perk for being totally useless they could change his function to be a sort of wallhack that will show any deployables within a certain range.
The proxy mines are already extremely good without any random kills added to their marks (which is also the factor which made them very popular among newbies).
Also i would improve the visibility of the color of enemy/teammates “aura” or at least add this like a feature in the advanced video settings/xhair stuff.
Maybe if you are just playing relaxed pub it couldn’t appear like an actual thing but in a competitive environment is certainly something that becomes a problem, expecially in frenetic situasions.