Crt X1 Batt. Tray Placement

Like the title says...i'm about to mount the RCM battery tray on my CRT chassis....it will pretty much take up one side of the chassis,my question is ....should i mount it as far back as possible ,or as far forward as possible ,or in the center ?? i will be running a single 5s,with the Neu 1515 2.5d motor on the opposite side and was just curious what would be the optimal tray position for weight bias and if it really matters ??....thanks for any advice and help