I only use 2 per charge and always in parallel. Not sure, but I think the debate is on going, over how to do large clusters.
I just run 2 though same hole in bulk plate, so my BP's don't look like swiss cheese....lol Then once inside bay, twist stripped ends together in pairs, cut them to 1/4in & insert in terminal block. If ya got terminal block on outside of BP's..even simpler.
Over the years on these: Strato's all types...MAWD HiAlt-45 CF....R-Das....Raven...Adept-22... Telemega...All Missleworks.
Using standard 9v or LiPo's [single cell 3.7 & 2cell 7.4]
Years ago I flew an L-3 size rocket & the "perfect storm" happened. R-das & Mawd. Apogee went fine...main was disaster. R-das channel didn't work and Mawd back up had a bad match! Redundancy down the toilet.
Had I used 2 matches per channel as I do now, it would have saved the day