Yes, you can use a breaker larger than 15A to power the Gen 2 Vue.
If you are going to tap into an existing breaker, the short black 14 gauge wire we supply in our accessories kit is only rated for 15A. If you choose to power the Gen 2 Vue with a larger amperage breaker you will need to use the appropriate gauge wire for the tap.
If the breaker is unoccupied then there is no need to use the wiretaps included with the installation kit, the Vue’s wire harness can be installed directly into the unoccupied breaker.