When you want to put up a picture frame or affix a router to a wall, drilling multiple screws can be difficult to get right. Put paper on the screw holes and rub with a pencil to make the measurement easy, says Imgur user fraz9999.
Your paper will obviously need to be long enough to cover both holes. Once you have the rubbing, put your paper up on the wall and use a level to make sure it's straight. Drill your screws in the middle of your rubbing, and you're done.