Honestly it depends on what you want your wallet to hold. I use a Ridge wallet (I had a knockoff for a while but treated myself to a forged carbon Ridge with blue inclusions that I really like the look of).
I only carry 4-5 cards though, and a couple folded bills in the cash strap. It goes in my front pocket because that’s just more comfortable and is a somewhat more secure place to keep a wallet (not perfect, but marginally harder to pickpocket than a butt pocket and less likely to just slip out while going about your day). It’s made of metal, carbon fiber, and some replaceable elastic bands. It protects against RFID skimming, and is overall about the size of a trifold wallet. I consider it a BIFL wallet because it fits my needs in a wallet, that style may not work for you though.
Attended doesn’t mean you have to sit there and watch every second of it. It means you check on it consistently. Perhaps you walk in every hour or so, or use a camera to check it remotely, but in general it’s not great to just have heating elements running with no one around.
Even long prints while you sleep you can smell if something is going wrong and have smoke detectors to alert if sonething goes very wrong.