The benefits of all the usual Spinning Babies® techniques are good for anterior starting positions as well as the posterior starting positions. The usual techniques will not typically put an anterior baby who is in a good position already into a poor position. Hundreds, if not thousands, of women are doing inversions now, as you read this, and not having their head down babies go breech. Many are reporting more comfort and easier births.
There have been 4-5 cases in the years of this website (since 2002 and this is 2016 when I am writing this sentence) that I have gotten feedback that the forward-leaning inversion caused a head down baby to back up and go either breech or transverse. The women who told me about it chose to continue the suggested exercises and in 2-5 days their babies were again head down.
I think this is because a tight ligament is loosened but not balanced and temporarily makes the lower uterine segment unstable and so the baby comes up. By finishing the balance restoration that was begun the baby now finds room to settle head down again and this time without the chronic tension or torsion. Some of these women had a history of hard labors before and two were first time mothers.
Read the contraindications carefully and the instructions carefully, don’t simply try to imitate the photo or you will miss important safety considerations.