82mm MCUV Lens Protection Filter with Lens Cap Optical Glass Ultra Slim 18 Multi-Layer Coatings Nano-Klear Series

SKU: KF01.K82V4

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You can stack filters. Just buy filters of the same caliber and stack them (e.g. 58 UV filter, then stack a 58 CPL filter on top) 
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Yes, as long as the caliber is the same. 
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It can effectively reduce reflection on the filter surface and reduce ghosting and other problems. 
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After laboratory testing, it is guaranteed that there is no vignetting at the 14mm end when using the nikon Z 7 with the Nikor 14-30mm. 
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Yes, the UV filter mainly acts as a protective filter and is installed on the lens for a long time to protect the lens.