With the EV100 the sensor only needs to be mounted so the arrow points forward and away from metal or magnetic fields. On my 36 I put it in the cabinet fwd of Nav station. On the 34 I’d look for an out of harms way location in aft cabin. The computer can go anywhere you have power and SeaTalkNG. I also strongly recommend a rudder reference sensor - the autopilot will work 100% better with it.