Auth0 tenent platform for applications on barding

Hi team,

we are planning to migrate to auth0 and we located in canada which is a financial company. The question i had was ,for our daily development purpose such as integrating all our customer facing applications with auth0 do we need to get for each a application a tenent in auth0 owned cloud or do we need to setup in our own cloud such as azure/aws? Like trying to understand how it works , like how other prospect clinet of auth0 client using this approch? pls provide the details in depth.Let me know if you got any questions.