Which CMS to choose for a multilingual store?

Question

CMS

Good evening!
It would be desirable to learn or find out opinion of those who knows or faced similar tasks. In short, there is a company that sells goods, which has branches in other countries (Italy, Spain, France, England, Russia, etc.) for each country, the product catalog and prices are slightly different.
When the company had only 2 branches, I made a wordpress store for them, both have the same appearance, except of course a slightly different catalog, prices, and the language of the site itself. But the company began to grow very quickly, there was no time for long development and now we have 6! almost identical sites with almost identical names and domains (site.ru, site.it, site.es, etc.). Each site has about 600 products and it becomes simply impossible to administer them, and because of the required functionality (integration of various crm, Yandex markets, etc.), the sites have become quite heavy.
The challenge is to combine all sites into one, using subdomains, while not turning it into a huge clumsy monster. I know that there is such a thing as wordpress multisite, but there is no normal division of the database and in many things it is raw, and also obviously will not pull such a load.
What is the best platform to choose for such a project, so that the development would not cost millions, because you need support for plugins and integrations (deliveries, crm, etc.)

Answer 1

Look at October CMS + store plugin for it. There are a lot of integrations, the missing ones can be ordered from the authors.

Answer 2

In WebBasic CMS, multilingualism is out of the box, but not documented.

Answer 3

Yes, finish it on the same WP, put only PolyLang for languages