Where you put the displays has no effect on "interference".
The location of the transducers is what makes a difference as well as the frequencies selected.
They can cross-talk if the transducers are on opposite ends of the boat.
There are about a dozen Helix 5 models.
Edited by Wayne P. (04/29/18 05:38 PM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1