Eeew. Typical caravan wiring job 😬. Hammered in mains t+e flat cable clips, untidy wires, unsealed exit hole with unprotected cables going through. I would tidy it all up, using proper round cable P clips , screwed in, protection for the cables where they go through the floor and sealant in the aperture. Can’t see clearly from the pic , hope that’s not bare copper by the box. I think you could site the control box anywhere subject to it being protected from damage, I see the existing setup has slats over it. With a fragile telescopic antenna sticking out 😀. Oh well, I’d move it as you want and tidy it up. Be aware that these are high current wires and that poor connections or accidental shorts could have serious consequences, terminations and insulation both should be to a good standard,
Steve