I just got the OnePlus 9 Pro for my wife, got the China set with global ROM from shopee. No issues so far, VoLTe and VoWifi are working.

Any suggestion for a screen protector? Doesn't need to be a glass one, plastic is ok as long as it feels decent.

I bought a X-One Stealth Armour 3 for RM49 and it's totally crap. First of all it wraps all the way around the curves so it's very hard to apply, and secondly the cutouts are not precise - when I align the cutouts for the left button, the cutout is way off for the right side. Pretty much unusable.