In the past few years, we have covered plenty of iPhone ceiling holders that you can use for overhead videos. This 2M pantograph is also worth a look. It can be used for studio photography but you can also attach your phone to it for overhead shots. You can adjust the length to get closer to what you are capturing.
You can use various adapters to attach your favorite gear to this pantograph. This particular version can be adjusted from 43 to 200cm. It has 15kg max load capacity.[HT]