The same holy/prot spec is fine for your main healer: https://classicdb.ch/?talent#sVxurg0xVGLI0z

I actually have no idea what a good PvE ret spec is. Never played ret in vanilla. Something like: https://classicdb.ch/?talent#sxVzZxGZVfcxbfV

Have a look around on Google though, I'm just guessing. Best spec might also be a little different for boxing since (IMO) you'll definitely want the 2 points in Guardian's Favor to have as much uptime on freedom for your warriors as possible.