When connecting 2 or more floating PSU in parallel, say for more current, be careful to match the output voltage as near exact for all paralleled supplies. All paralleled supplies sense and will adjust to regulate the voltage output. If they have unequal output voltage or even regulation specs, the better supply will compensate for the lesser supply. In high current usage, it could overheat the better supply. You could say all specs of the better supply will be reduced somewhere between its specs and the lesser supply's specs: regulation and recovery time, ripple etc.,