For a while I was doing an art project where I was attaching small placards to telephone poles. At first, I was nervous that I would be confronted about this, and made purpose built, discreet hand tools for this purpose.

I quickly realized that nobody on the street gives a shit if you just walk around with an electric impact driver screwing things to telephone poles. Maybe things where you are are different, but the police around here really aren't interested in interacting with anything that dispatch didn't tell them to interact with.