Rocket Fireing at teh same time

I'm about to build a Rocket Fireing A Frame, I have about 20 rockets to send off in the Grande Finale of my firework display.
I'm kinda thinking A Frame with 20x Drain tubes fixed to it, then just light the fuses from one side to the other.

Its something that I want to build and to last many years and to be used many times.

Advice would be really appreciated.

Brian