I'm not discouraging you from doing this if cost is not an issue, but do you really need four channels.....???
Are you going for full time monitoring?
Or just tuning and then remove the thing?
I used to be part of the import tuner scene, ( I built my wife an ATI procharged 430RWHP high 11 second, Low 12 second daily driver, it was a Nissan 350Z)
Some of the cars I was around were extremely profesionally built magazine worthy cars, with more than $70K in them, making over 1000rwhp, no shit I've seen an Inline six Toyota supra put 1100+ down, no nitrous on the top end, just off the bottom to spool the huge turbo up........and then drive home....
Even the Nitrous/Turbo cars like the Supras I was around at various dyno contests and the drag strip rarely ran more than one sensor. either the right or left bank of the engine....
They assumed if what they were doing was working on the half of the engine they were monitoring then it was working on the other half they weren't monitoring...
But if money is no object it would be a nice luxury to have...I too have been accused of having too many "doo-dads" on my vehicles...
Rusty