After fitting several of these to previous Caravans and several Motorhomes, the best tip I can give you is common sense really. Think about what you will be plugging into the sockets and position them strategically. For instance, one Caravan manufacturer has one of these sockets above a gas hob, meaning anything plugged in whist cooking is a potential hazard. I've seen them fitted low down near beds for charging phones, but too far away for normal charger leads, meaning a phone on the floor. Just imagine what you're using each plug for, the length and route of the appliance lead you're plugging.
I can imagine you're fairly restricted where these can be installed in a T6, giving the depth of the actual socket unit, but careful mocking up works wonders, all stuff you know about.