It’s always better to error by focusing too close instead of too far. This is because the depth-of-field works in a way where 1/3 of the depth is in front of the exact point of focus and 2/3 is behind said point. Except in the case where you have your lens focused to the closest focusing distance, in which case 1/2 the depth is in front and 1/2 is behind the point of focus.