
zza ni |

as mentioned any bonus to hit will add up.
also there is a very nice teamwork feat that allow to roll twice and pick the better if you try and trip some1 who the team member threats.
builds with ways to get a companion\work teamwork by themselves or (small or larger) valet familiar (who gain your teamwork feats) can use this without forcing the other players to pick the feat themselves. (i used it with an invisible familiar since he only need to threat. not actually attack)