you can use https://vercel.com/ to deploy your site

its the easiest way

You can use either a dynamic route in next.js or a wildcard subdomain.

1. dynamic route example.com/[name] -> example.com/john-doe to access the website
2. wildcard domain *.example.com -> john-doe.example.com users access the website using subdomain. Both Vercel and Cloudflare offer great wildcard domain support for which the trickiest part is getting the SSL for.

Then you can extract the host header in middleware and rewrite the request internally to a dynamic path under the hood to include the tenant.

For simplicity I would just go with the dynamic route until you get real users using your app.