As far as the spraying goes, sometimes it depends on how old they are when they are neutered: the younger (within reason of course), the better chance they will never spray, or stop if they have already started.
How old is he?

I have 2 males who were both neutered at about 6 months, and I have never had ONE problem with spraying
And yes, females DO spray too sometimes.................although it's a little more common with males.

Wylie (1 yr. now), calmed down quite a bit when he was neutered last summer.

Good luck!!!