Start with a local question. Keep the network, language, and delivery settings separate so the result tells you something useful.
Belgium needs more than one language journey
For a Belgian storefront, compare Dutch and French while holding the proxy exit and delivery postcode constant. Follow the language selection through search and checkout. Add German when relevant to your product's audience; the country's IP address does not set the visitor's language preference.
Distinguish Belgian offers from neighbouring markets
Compare Belgium with the Netherlands using the same Dutch query, or with France using the same French query. Record the chosen market, seller, and currency rather than assuming matching text means matching offers. Reuse an identical item identifier wherever the catalogue exposes one.
Use postcodes to investigate delivery differences
A Belgium country route cannot establish service in Brussels, Antwerp, or Liège. Enter those locations through the application's own delivery controls and retain the selected postcode with each capture. If availability changes only after address entry, investigate delivery rules before changing the proxy setup.