Where do you mount the brain/relays

Hi,

Happy New Year.   I got my wife a remote car starter and would like to install it myself.  It's a Design Tech Airwolf/20096.  I wish I had spent more time looking, since this thing has more than she probably wants/needs and also seems to get mixed reviews... but we have it now, so I think I'll go ahead and use it.  I've gone as far as getting the wiring diagrams (thanks to this site), picked up the 3 relays I need for her car (1998 Dodge Caravan) and took the lower dash and kick panels off to see where the connections go.  Everything SEEMS pretty straightforward (probably isn't, though).  The biggest question I have is where and how exactly to physically mount the brain/control box ... and the relays.  They have mounting ears on them, but where do you normally attach them?... to the firewall (doesn't seem to be much room, especially on the driver side)? On the side kick panel (on the outside, into the plastic facia?... Probably dumb questions, but I guess it's better to ask.  Funny that I think I can handle the techie part of it, but I'm getting hung up on the cosmetic mounting issues). 

Thanks in advance - Keith