Nitrous plumbing A1A...??..

Okay the research continues...
In my mind I always had it (the bottle)mounted on the passenger rear floorboard so I can just reach over and turn it on? There must be a reason people put it in the trunk? To hide it? LOL... I'm asking this because of the length of hose from the tank to the solenoid? I assume I want it as short as possible as I don't want to be putting a half a tank into an 18 foot line LOL..
I've been adding stuff into my Summit cart and looking at blow off valves and of course a purge system... Most of it is the zex brand and I've noticed even the complete dual quad kits don't come with quite a few things.. Beyond simple wiring some T fittings and some trigger switches I seem to be puzzling something together here for $100 or so less then a complete kit, but yet with all the extras as far as Purge kits blow off valve and so on.. right now the real money saver seems to be the Speedmaster plates with all the bracket tree and hoses and bottle mounting brackets that come with... I have it in my mind to just order those through Summit and see their quality before I start buying the rest of the kit around it... If I had those and just the solenoids I would be able to mount them under my carburetors and the solenoids would have any vacuum leaks blocked off??.. I would also probably want to get my starter Jets in there as well??..
I have the 2in risers for my carburetors thought I was going to put on my tunnel ram and now deciding whether I should put a nitrous plates right under the carbs or down low between the spacer and the tunnel ram?? Seems like down low near the action would be the best? if they don't have anything really to do with the carburetor except for the full throttle trigger...