Hahaha, I completely understand the OCD part of you wanting it dead centre, but it's definitely not necessary, just like it's not necessary for the paddle sensor to be right in the centre of the paddle.
Just off centre of the foredeck will work just fine.
Rob
Currently Epic V10 Elite, Epic V10 Double.
Previously: Swordfish S, Evo II, Carbonology Zest, Fenn Swordfish, Epic V10, Fenn Elite, Red7 Surf70 Pro, Epic V10 Sport, Genius Blu, Kayak Centre Zeplin, Fenn Mako6, Custom Kayaks ICON, Brian's Kayaks Molokai, Brian's Kayaks Wedge and several others...