Yep, you'd need 4 bricks.
And use parallel / serial harnesses.
Parallel + serial.. ( btw, pay no attention to the color coding of the serial connectors, they are incorrect. but the polarity of the connection is correct ( it is hard to screw up a serial connection ) ).
Or you can do a permanent serial like so.
( mind you, these packs were cycled a few times and tested otherwise to make sure they were good before i wired them up like this. Don't do this unless you have known good lipo packs. )
Then use a big ol' parallel harness to link it all.
or for 6s packs, you may want to do 2 big parallel harnesses to 1 serial harness. This makes more sense, here i am using 5S as an example, and have used permanent serial since i have a 10S balancing charger.