Stock FSX ATC position is not always positioned correctly on the airport and is rarely at the right height, many has tried finding solutions for this, coding and using the “elevator trick” shift + enter. There is no more need for that as this is the far best solution to this problem and it will move the entire virtual-tower platform with you without taking much time at all. As a matter of fact it is done in seconds, follow this guide for how to. Open your menu by using Alt so you will have the options on top, third from left is World, choose Map. (the guide continues under the picture)
The altitude is usually the most common problem, meaning you are covered up behind some building or the actually tower itself, once you are inside the “map” look for the altitude settings, set this to the desired altitude after own taste or preferences. (the guide continues under the picture)
Once at right altitude you are usually pretty much set, there is also the option to alter the direction of the tower using the ‘Heading’ if the stock settings should be a problem and same goes for the position of the tower as you are able to drag the position of the tower repositioning the marker on the map, Good Luck.