If you’re a perfectionist like I am (on a good day, anyway), you will want everthing lined up neatly on your PowerPoint slides. To do this, use Drawing Guides. To do this, choose View, Grid and Guides and enable the Display Drawing Guides on Screen checkbox.
You’ll see two cross hatch grid lines. To move them simply hold your mouse over them and move one. To create a new guide, hold the Control key as you drag on an existing guide. To remove a guide drag it off the slide.
You can now neatly line everything up that needs to be lined up.