Consider sound deadening your vehicle before adding additional power, more power = more rattle and reverb. You should locate what power source or circuit you are connecting into and calculate off the amperage\voltage that alternator and wiring can sustain at load...
OBD locks are on amazon for $40 and they wont protect you. A thief is going to laugh and probe the 2 canbus wires that are visible right behind your lock. They can also do this from outside the vehicle where other canbus wires are accessible.
I did in fact install the front door Tacoma ones. The process sucked but I got it done in the end, and it fits.
I don't recommend anyone else try this as drilling into your doors is dangerous as the drill bit can slip forward and dent the exterior door panel (less than one inch air gaps in the...