Once the midpoint of the battery bank is connected one battery balancer can be used, instead of using 3 battery balancers (one for each string). Also, a single BMV can be used for midpoint monitoring of the entire batetry bank.
But please be aware, that the only reason to use the midpoints of a battery bank is for balancing and/or monitoring purposes. It is not allowed to connect loads to the midpoint of a battery bank in order to be able to run loads that require a lower voltage. Doing so will create a large imbalance in a battery bank. This imbalance is bigger than a battery balancer can rectify (larger than 1A). The battery that is used to provide the lower voltage will fail prematurely.
For example, do not do this:
But instead use an Orion DC /DC converter:
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