I have a Smappee energy monitor, it's connected to the main input and "detect" the different equipments. It's good to monitor the overall energy consumption and production if you have solar pannels but it's not able to detect everything.
In summary, it can tell you the consumption of anything with a resistor (electric oven, motor, cofee machine) or a motor (roller shutter, pump,...) but for electronic, PC and other things for which the power consumption is not regular it won't help you much. For this, I think monitoring individual component will be the best.
But as you probably plus a pwoer meter on each plug, maybe a combintation of both will be a good choice.