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I am taking a SWAG as there is not enough information to completely answer the question. Knowing the loads would help along with a rough schematic. Have you considered the size of the wire you will need. #16 AWG wire at 2 meters will drop about 0.5V, leaving you 4.5V at the end of the cable with a 10 Amp load. This is about the minimum voltage for many 5V devices Try this calculator, it will help you determine wire size as you do not give enough information to do it accurately. I know this is not what you want to do but consider using a 12V or 24V supply with a buck converter at the end of the 2 meter cable, your voltage will be much more stable especially if it is not a constant load, which you did not mention. You can also use a second buck converter at the controler end, that leaves you with one power supply. Considering you were thinking of PoE by using buck converters you can up the voltage, and reduce wire size even more.