SonicWall supports a feature called Dynamic External Objects that can utilize a MineMeld feed perfectly fine, you just need to ensure that you utilize the 'tr=1' option to get the output in CIDR format on your feed.
Unless there is a fianancial burden to stay with the SonicWalls, I would recommend looking at the lower end PAN's as they ahve many more features that can help protect your environment.
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