Hello @Alphabataz,
Yes, you can use a 20A breaker to tap into for powering the Vue. Please note that the wire for the tap we supplied is only rated for 15A, so please make sure you have the right gauge wire for the larger amperage of those breakers.
It is safe to have the white and blue from the wire harness under the terminal in the neutral bus bar.
Please let us know if you have any further.
Adam