Belt and suspenders mentality. I suspect the first blower disturbs the sawdust in the chip seperator and pushes more sawdust into the second DC unit, likely clogging the filter bag much quicker. I'd never do that, even though I have a second DC blower around here somewhere. I have a Rockler fitted chip collector connectors on a 30 gallon fiber drum. But if I were doing it again, I'd have the large cyclone separator on top of a drum.
Here's a pix of my my DC gear, placed in a covered area between the shop shed and a small office shed. It forms a breezeway, is out of the rain and all the noise is outside. I'm thinking of putting the compressor out there too.
The more I do, the less I accomplish.