I've seen stock eliminator cars with a master disconnect on the rear panel. That seems really nuts to me unless there is something else going on with the wiring that I don't know about. If they are running a hot cable all the way to the back just for a disconnect switch then it seems like it is less safe than not having a disconnect.
With a battery up front and no disconnect switch there isn't a lot of hot cable. For my car I'm going to use a Ford type solenoid so the starter cable is only hot while cranking. So the only hot line when the key is off is the BATT feed to the fuse panel under the dash.
There is some Solid State disconnects now that seem pretty neat. You would have the actual disconnect up front with just some small wires running to the switch in the back.
Like this one from Motion RaceWorks.
https://www.motionraceworks.com/store/p841/BatteryKillSwitchKitI do not know about NHRA legality though since it is not a mechanical disconnect.
