Saros 10R Dirty Water Tank Deodorization Module Accessory, Compatible For Roborock, Qrevo Curv/Edge Saros 10 Part(Module 2pcs)

I just linked to a generic one, they have them for the Saros. I don't use/have one, I would assume the second slot is just for a second one for a stronger effect? Does the manual say anything about it? https://www.amazon.com/Deodorization-Module-Accessory-Compatible-Roborock/dp/B0FFP4QSSZ