Be careful when operating pumps in parallel without dedicated min flow lines on each pump.
Imagine two pumps in parallel, each one operating back to the left of the curve. Now, no two pumps will have the same performance curve and, thus, one of the two pumps will have a slightly higher head than the other. In this case, if you have check valves at the discharge of each pump, the pump with the higher head could close the check valve of the other pump causing it to deadhead.
Best practice is to put the min flow recirc line IMMEDIATELY after the pump (before any valves). You can combine the min flow lines downstream of that point if you want and terminate that line in your DA tank.