Yes, LG V30+ is a dual sim mobile phone.
Yes, LG V30 Plus does have the face unlocking support.
No. LG V30 Plus does not have the in-built FM radio but there are plenty of Android apps available and you can download the same from Google Play Store.
LG V30 Plus is IP68 certified. It means it is water and dust resistant. It is also 810G US military certified product.