If you aren't concerned about a disease wiping out a multiple display system, I'd say go for it. I'm not gonna do it just because for me, the payoff isn't worth the risk.
I'm a clown enthusiast. As you probably know, it's not a great idea for more than one pair of clowns to be in a display (yes there are always exceptions.) So, I have set up rack systems for said clowns and it has always worked out poorly for me when they had central plumbing. Today, even my 10 gallons have their own filtration systems. I've considered reattaching them to a common sump and in the case of disease, I would still have sand alone filters to treat, but I decided against it because because by the time you detect a disease in one pair, it's already too late. I feel the same way about larger volumes of water. It always seems like so much less effort to centrally plumb them but the amount of time saved maintaining the water quality of two or three systems, it minimal. I'm not a big chemistry chaser. So, for me it makes more sense.