If an owner used a pair of bigger hinges attached to the panel frames, he could pull the hinge pins to separate the two modules for independent carrying. There's nothing in the Commandments about having them together but it's a safe storage solution since the working surface is protected.
If someone does DIY with portables, the converter should go near the batteries and the panel output wires connect to that. There is more efficiency/harvest by locating the controller near the batteries.
FWIW, I use a Morningstar MPPT-15 controller and there is no RFI/EMI from that. It may be that having no amplified antennas make me immune But the whole rig is a giant antenna, crossed with wires in every direction.