I'm thinking the kind of small cafe

Just for that a Zeus POS is enough. You can run it with a remote node or embedded node (using a tablet for example) Here I wrote en extensive guide about Zeus: https://darth-coin.github.io/wallets/getting-started-zeus-wallet-en.html

Here more examples:

• https://darth-coin.github.io/merchants/bitcoin-lightning-payments-irl-en.html
• https://darth-coin.github.io/merchants/getting-started-bitcoin-small-merchants-en.html
• https://darthcoin.substack.com/p/lnbits-for-small-merchants
• https://darthcoin.substack.com/p/getting-started-lnbits