Update 12 November 2021 see the Spanish SC confirming (Marta Requejo Isidro review of the case and link to the judgment), it seems, the limited approach which I discuss below), meaning: the Mozaik approach no longer applies when the buyer has not purchased the goods affected by the collusive arrangements within the jurisdiction of a single court, territorial jurisdiction lies with the courts of the place where the undertaking harmed has its registered office.
After having noted the limitation of the questions referred to locus damni  (excluding therefore the as yet unsettled locus delicti commissi issues) the CJEU confirms first of all  that Article 7(2) clearly assigns both international and territorial jurisdiction. The latter of course subject to the judicial organisation of the Member State concerned. If locus damni x has no court then clearly the Regulation simply assigns jurisdiction to the legal district of which x is part. However the Court does not rule out  per CJEU Sanders and Huber that a specialised court may be established nationally for competition law cases.
The Court then  applies C‑343/19 Volkswagen (where goods are purchased which, following manipulation by their producer, are of lower value, the court having jurisdiction over an action for compensation for damage corresponding to the additional costs paid by the purchaser is that of the place where the goods are purchased) pro inspiratio: place of purchase of the goods at artificially inflated prices will be locus damni, irrespective of whether the goods it issue were purchased directly or indirectly from the defendants, with immediate transfer of ownership or at the end of a leasing contract .
The Court then somewhat puzzlingly adds  that ‘that approach implies that the purchaser that has been harmed exclusively purchased goods affected by the collusive arrangements in question within the jurisdiction of a single court. Otherwise, it would not be possible to identify a single place of occurrence of damage with regard to the purchaser harmed.’
Surely it must mean that if purchases occurred in several places, Mozaik jurisdiction will ensue rather than just one locus damni (as opposed to the alternative reading that locus damni jurisdiction in such case will not apply at all). However the Court then also confirms [41 ff] its maverick CDC approach of the buyer’s registered office as the locus damni in the case of purchases made in several places.
Here I am now lost and the simply use of vocabulary such as ‘solely’, ‘additionally’ or ‘among others’ would have helped me here. Are we now to assume that the place of purchase of the goods is locus damni only if there is only one place of purchase, not if there are several such places (leaving a lot of room for Article 7(2) engineering both by cartelists and buyers); and that, conversely, place of registered office as locus damni only applies in the event of several places of purchase, therefore cancelling out the classic (much derided) Article 7(2) Mozaik per Shevill and Bier – but only in the event of competition law infringement? This, too, would lead to possibility of forum engineering via qualification in the claim formulation.
I fear we are not yet at the end of this particular road.
EU Private International Law, 3rd ed. 2021, Heading 220.127.116.11.8.