The whole idea behind anchoring is so that your hand has a stable resting place and, as it were, a fixed starting point. This way, your fingers will always be in more or less the same spot when approaching the strings making accuracy easier.
Look at how Ben’s hand is planted in his videos. Most players plant like this. Some will only plant one finger. Some even plant their fingers behind or very close to the bridge. There is no right way but you want to be consistent and in the same spot most of the time.