First, it’s important to realize that Meta is likely tracking you already through its ad-related services even if you don’t have an actual FB account. Countless retailers and services are using Meta and Google for ads and analytics and it’s virtually impossible to be completely off their radar if you do any online shopping, banking, or service consumption.

Even with the use of VPNs, uBlock and other tools, Meta likely already has your particulars, including full name, phone number, email, and physical address simply by way of family members and colleagues saving that information to their own address books which are then shared to Meta through FB, WhatsApp, etc. In this way, your name, phone number and/or email address has likely already been associated to otherwise anonymized data through retailer back-ends.

That said, if Marketplace is important to you I would simply create a FB account and use it solely for that. I would avoid installing any FB/messenger apps, and opt for a browser-only experience in order to minimize additional privacy infringement. Use FF containers, incognito mode, or a separate browser altogether for FB access if you feel it’s necessary.

Meta has taken a hardline approach to fake/obfuscated accounts, so I suggest using legitimate tombstone info but only provide what’s necessary for account generation. Anything less and you’ll risk a deactivated account, or Marketplace ban.

Don’t overthink it. If you use the platform with basic care (no apps, no persistent cookies), then the most they’re going to glean is that you like shopping for retro games and other used goods.