nice rack!
is really the MISSING part if one wants bi-directional flow and CRC.
@Idab916 OP pointed us at this critter
@JazzBandit you could certainly put filters at both ends of your column. I suggest you look at racked systems to understand how to best achieve your goals, especially long term ie: adding CRC.
you don’t want to build a monstrosity along the lines of subzero (pre CRC)
Looks to me like @StoneD started with gear similar to what you have. Then he went to a rack so CRC wasn’t stupid. (Guessing)
Others resort to nailing stuff to the wall.
(You might want to explore that entire thread…)