In Final Draft 12 / 11, you can choose to align Beats and Structure Points to the grid by going to to Format > Grid Snapping (you must have the Beat Board displayed to enable this command). This causes newly-created Beats or Structure Points to move to the closest grid line, if they are not close to a line.
Additionally, if you multiple-select Beats or Structure Points, you can right-click or Control + click on the group and from the context menu choose
More information is in this video:
Final Draft 10 does not offer these Beat Board functions. Information on upgrading to Final Draft 12 is HERE.