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Polarizer probably won't work too well at super-wide angle anyway -- you'll easily get uneven colored skies for instance.
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That depends on how wide the "wide angle convertor" is. For example, I have no issues using a polarizer on my 17-70mm lens, which is 27mm equivalent at the wide end. However, I do see some issues on the wide end using a CPL on my 10-22mm lens (16mm equivalent on the wide side).
If your wide angle convertor is no wider than around 24mm (35mm equivalent), you should be okay, IMO.
I do agree with Man, though, on not placing the filter between the lens and the convertor. You can try it, but I think you'll have vignetting problems, as he mentioned.