It is the nature of voltage sources that only ONE unit can establish the voltage level in a system here several are paralleled. If low source impedance voltage stabilizers are paralleled ith no special effort to form a master- slave relationship, the power supplies themselves will sort out who is to be boss. Only ONE unit will end up controlling the voltage while the others overload into their current mode and merely add their current to the total. The combination of such power supplies always ends up with just one voltage stabilizer. All of the other units operate in current mode.
This unit is 1/2 rack size, mounted in a rack frame.