Piping a buffer tank

Wellness

I just got a 40 gallon ECR International buffer tank, H2OBT402. This thing has seven pipe connections! Five two-inch and 2 one-inch (instead of just the five they show on the cut/installation sheet). I piped my old buffer tank like the illustration at the bottom, using the top side inlet for boiler supply. But I've been reading that best practices encourage using a 3-pipe configuration. That's going to really increase my install costs (new Tee, air vent, etc. and that still leaves me with the 2 one inch top openings feeding an internal coil that looks like it's feeding a repurposed DHW or solar tank. I would be interested in your thoughts.