Set up a repeater's Angular mode
Place copies around a centre point by setting the Angular mode's centre, radius, angles, step and direction.
A repeater's Angular mode has Centre X / Y, Radius, Start Angle, End Angle, Angle Step (degrees), Direction (Clockwise / Anticlockwise), Rotate Along Path and Keep Only Copies Inside The Panel.
With Start and End Angle both 0 and an Angle Step of 30 a repeater's Angular mode makes a full ring of 12 copies.