IMHO, you must inspect each such zip's content, frown, try to decide easiest approach. Frequent breaks for caffeine may help...

Some Zips unload by default to give Runtime as top folder. This can be a real nuisance if there's any 'baggage'  such as ReadMe, template and licence files. Must unzip such some-where safe, lest baggage is misplaced. Your un-zipper may have option to unload into folder of that name, simplifying things. Rename that, move in Zip, web-link and product piccies, craft a 350x350 folder.jpg, smile.

Some unload by default as a generic folder holding the Runtime plus its baggage. This is okay, because convenient to re-name, add a folder.jpg.

Some manage to put Runtime two or three levels down. This is common to dual Poser+DS models, as DS needs extra admin levels atop the Runtime tree...

Then, there are truly classic models that lack any Runtime: OBJ if any, PP2, textures and thumbnail just fall out. I keep a vacant  'Runtime' folder tree for such. Copy into a new folder, rename, consult arrivals' ReadMe, shuffle files into appropriate sub-folders. Sometimes, everything is properly pathed. If necessary, edit PP2 path-calls with Notepad, Wordpad or one of the  PP2 editors...

Asian models, including many real-neat props from eg RDNA era, often have the added complication of glyphs in file-names. Unwary PCs set to 'Western' may un-pack such as 'dipthong soup'. IMHO, these need Bandizip. The free version has its own quirks, such as polite nagging and, yes, living a right-click menu-level higher than eg 7Zip or IZarc. It will let you select the file's code-page then un-pack with intact glyphs. After that, 'Google Translate' is your friend...

FWIW, many recent MMD PMX freebie props can also use this 'Bandizip' workflow. Happens free PMX_Editor can export their mesh as OBJ+MTL. If 'handed', remember PMX has reversed sign-convention, so use PMX_Editor's mirror tool before export.

Please DO NOT port ANY MMD mesh or material derived from TDA source, due TDA's non-port T&Cs...