Zombie lights

Question:

I have a two lights bars, ditch lights, and four scene lights (27 amps total), if I wanted a switch that turned them all on at once should I:

a) split the load lines and wire them all into a busbar with a 30 amp fuse and run that bus bar into a relay to the switch

b) split the 12v line coming out of the individual relays and splice five of them into one switch

any examples out there

 

Just like the headlamps in the Tacoma.

 

https://www.youtube.com/watch?v=cWkLgkqMVfY

In case you doubt the 4 wires to one terminal...