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Recent advances in metre-wavelength (m-$\\lambda$) Faraday rotation measure (RM) grids are enabling precision probes of cosmic magnetism, with implications extending to early-Universe physics, AGN feedback, and the magnetized circumgalactic medium. Here we model the m-$\\lambda$ polarized source counts to predict an RM Grid density with SKA-Low of $N(>P) \\sim 5 ({P}/{100{\\rm \\mu Jy}})^{-0.75}\\,\\, {\\rm deg}^{-2} $, where $P$ is the polarized intensity detection threshold. 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