Moto Z2 Play SAR value are as below:
SAR Value (Head): 1.455 WKg/1g
SAR Value (Body): 1.24 WKg/1g
Yes, Moto Z2 Play does have fm radio.
Yes, finger lock is available.
Yes, Moto Z2 Play comes with the inbuilt battery.
You will get one Style Mod free but you have to buy Camera mod, Battery mod, etc. if you want them.