I actually had some correspondence with the guys over at Primary Arms on this very subject...
--Question to PA--
Hi, I am interested in the Primary Arms 3x red dot magnifier and flip to side standard height mount. I am currently using the Bushnell 1x32 Trophy red dot scope. Do you know if your magnifier/mount above will line up correctly with the scope? Many Thanks!
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--Response--
The magnifier in our flip to side magnifier mount will actually sit too tall. The Bushnell 1x32 model of red dot scope sits at absolute cowitness, where irons are lined up thru the middle of the scope, while our mounts put optics and magnifiers at lower 1/3rd cowitness, which is slightly taller. On a side note the 1x32 is a fairly large optic, I'm not sure it allows enough space behind it for a magnifier if everything is mounted on the receiver rail.
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So not very good news on the PA magnifier products. I actually decided today to return the Bushnell and ordered a new Lucid HD7 with 2x magnifier. Once that comes in I will let everyone know more about it.