background:
to renovate my 1st house (small condo)

idea:
to have smart home at low cost, dont want pay to "smart home vendor/contractor" to charge me additionally to reno company.
plan to purchase all smart home needed devices myself, then pay to the reno company to help install it when they do the electrical point and plaster ceiling.
then self software setup the devices.

existing info i got from DouYin (China tiktok):
xiaomi mijia smart home has the most widest sensors and smart home devices at affordable cost.
also, reliable xiaomi mijia apps at handphone.

questions:
1) the voltage for xiaomi mijia china is at 220V 50HZ, malaysia is 240V 50Hz, can it operate? anyone tried taobao BIG electronic appliance in malaysia? eg: Refrigerator? any issue?

2) can the china version phone app operate in malaysia to control smart home with china imported smart home hardware?

3) i see mostly fuse used in malaysia electronic appliances is 13amp, i see china mostly is at 10amp or 16amp. any impact?

4) any recommend if not xiaomi mijia smart home? any brand wide coverage at low cost? or any smart home brand famous in malaysia market?