A question about region locking

Apr 18, 2020
So I want to buy the EU sensor bundle. EU gateway is included. Now if I would ever want to upgrade my smart home setup, should I buy local or on **********? I know this region locking mess, so I got a question: If I buy ( probably sensors, yeelights and sockets) on **********, will I be able to add the new devices to the EU gateway? I read on this forum that not all devices are region locked, but what devices? If I see a device available in the Xiaomi Home app (on EU server setting), does that mean I can buy it from anywhere?