Mass setup of Android devices

I want to setup **the same account** on 300+ devices. I did that for 4 devices and I am tired. Setting up new device includes: 1. manually doing all ok/next/skip choices 2. connecting to WiFi + installing updates 2. manually typing GMail + password 3. **MOST PROBLEMATIC** confirming new device by tapping two-digit number on the first device where this account was added. Questions: * Is there some automated solution? * Is it possible to at least **turn off confirmation of new device** completely?