What number did the album that the Playlouder critic believed was better than Iowa peak at on the Canadian sales charts?  Answer the above question based on the context below:  Critical reception to Vol. 3: The Subliminal Verses was generally positive. It received a score of 70% on review aggregator Metacritic based on 12 reviews. Johnny Loftus of AllMusic called the album "not just another flashy alt-metal billboard", praising the band's "dedication to making it a Slipknot album". Todd Burns of Stylus wrote that people who accuse the band of having "softened" are "mistaking softness for maturation". Burns went on to call the album "the best pop inflected metal album since System of a Down's Toxicity". Sean Richardson of Entertainment Weekly gave the album an A− and wrote that it is a "deranged hippie update" of Slayer's "masterpiece" Reign in Blood, which was also produced by Rubin. Q hailed Vol. 3: The Subliminal Verses as "a triumph". John Robb of PlayLouder complimented Slipknot's unexpected rise to become "one of the biggest groups in the world", dubbing "Before I Forget" a "classic [Slipknot] anthem". Robb added that the album is better than Iowa, citing its "differing textures". Rolling Stone gave the album a rating of 3 out of 5, stating the album presented "newer extremes" for the band, "which in Slipknot's case means tunefulness and traditional song structures".A review from the BBC praised the album, declaring that there "is no finer metal band on the planet". It cited the group's integration of "hyperactive bass drums, complex, compelling riffs and ridiculously fast fretwork" with more melodic styles and described Vermilion as "the key track ... an emotional, melodramatic, utterly convincing rollercoaster ride".Alternative Press criticized the album, writing that it "plays out like a tepid, second-rate version of Iowa, which pretty much makes it a third-rate anything else." Yahoo!'s Chris Heath also reviewed the album negatively, writing that "The Nameless" combines "the ludicrously vicious and ridiculously placid" and that by doing so makes the track feel "awkward". Heath added, "the themes are predictably absurd ... yet mildly comical given the inclusion of such...
The answer to this question is:
two