A reveal of one stone and its location is a small sample size, but if the stones were not randomly placed and are actually where they started at the beginning of the movie Infinity War, they should be in these places:
https://time.com/5227586/mcu-six-infinity-stones/
Power Stone: Thanos
Mind Stone: Vision
Reality Stone: The Collector (I think?)
Time Stone: Dr. Strange
Soul Stone: Red Skull
Space Stone: Loki
Granted, we were told that the stones were placed with the Avengers and their allies and calling Red Skull or Loki allies flies in the face of logic, so take this with a grain of salt for now.
To be safe, though, I would agree that if you are one of these characters, don't reveal anything yet.
Here's the stone post again. I've only seem the movie once, so this was based on the time article. If any movie experts want to amend/correct, feel free.