Is a bleach bottle over a rock 2 ft below the surface a hazard to navigation or is the rock the hazard? Go for it, no one will say anything. Wrap them with reflective tape if you are worried about nighttime visibility. The boats nav lights will get reflected.
As far as which side you should pass the marker on? I will normally opt for the side where deeper water “should be”. Unfortunately, I’ve paid for that once or twice.
There used to be bottle markers off Cow that had red & green reflective tape to mark the “channel.
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