Buying WiFi AP systems from overseas?

Are there any gotchas? Is there any reason not to order a Google Wifi, Ubiquiti, Orb, Eero style device from overseas? I'm thinking about regional spectrum, availability of firmware updates or similar issues?

Have some weak Wifi areas in our 2 story house of approx 300m2, and would be nice to cover it with a single SSID that does seamless handovers when moving devices around the house.

Any recommendations or best-avoids?

Currently preferring Ubiquiti as they are way less expensive than the others. Hoping I could get away with two - one connected to the office VDSL modem and one at the other end of the house downstairs connected by network cable back to the office.

TIA

JohnO

edit: Oh, and being able to manage the kids' WiFi access would also be a requirement.