Default Which Rom Slot To Install [4.2.2][MIUIv5 4.2.14] Droid 3

Regarding the Motorola Droid 3 "Solana", I downloaded the ROM [4.2.2][MIUIv5 4.2.14] Droid 3 and attempted to install in ROM SLOT 1. However it 'failed'.

I am using SafeStrap 3.05.
  1. Which ROM Slot is recommended?
  2. Is this a KEXEC or NON-KEXEC ROM?

Thanks, Bruce.