Hi,it seems from what I've read from car sellers, a vsr needs to be connected positively between both batteries,surely this necessitates a physical dedicated cable running all the way from front to rear?
Or can the vsr be wired somewhere into the + lead in the boot you suggest already runs from front to rear,that you have already used to tap your aux battery too.
I'd like the auto function of a vsr instead of manual isolation switches I'd prob forget to set.  2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

Locate the VSR in the boot as you suggest. Also fit a heavy duty manual switch or HD relay operated from the front to bypass the VSR if the aux battery is required to assist starting.