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Brand + Product, in that order for Title Tag is definitely recommended not only for your SERP, but also to influence the quality of your Product Feed. Usually we do Brand + Product - SiteName. And if there is room, a USP at the end of that too. so: Brand + Product - SiteName + USP is our usual Title tag pattern. It's also good to have some variation on the On Page Title (H1) and make it different from the Title Tag. Usually the H1 is just the Product Name itself, and H2, H3's will reiterate the Brand/Category/Offer, etc.

You don't get penalized for duplicate meta descriptions. You could have every one on your site the exact same, it won't matter. It doesn't impact rankings. It impacts how likely a searcher is to click through to your website.