That photo is for the additive dosing module, which is only found on cars with 'wet' DPFs (that use Eolys additive for regeneration). As far as I'm aware that particular module is for cars with 1.6D engines, and is indeed under the rear seats.
As far as the part numbers and serial numbers for the ECUs fitted to the car, they can be read using VIDA or most of the decent garage quality diagnostics kit. If the people doing the remapping are unable to figure this out, then I'd be looking for another place to have it remapped.
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