Where/how to install amps on Supra 24?

I have 2 Kenwood X-542 Amps that I want to mount in My Supra. I know I want them in the compartment with the batteries in them on the passenger side, but what is the best spot in there? The dealer mounted the first one on the back side of the front-left bow seat, but I want them to be next to each other. Can you fit both of them on that inside wall that is just behind the walk-thru? Also, can the 2 amps share the same power and ground cables? I will be running 2 towers speakers and a 10" sub with one amp and the interior speakers with the other. I have asked this before, but how can I run 6 interior speakers with a 4 channel amp? Anyone have any picks of an install of the amps? Thanks in advance.