yup, you answered it, in those two upper PVs blood goes away from probe ( or the same direction of sound beam) so it will show negative shift that based on color box will be blue
any one will be fine just as I mentioned in cases of MR we have to do PW on both sides (lt & rt PV) because sometimes MR jet hit directly one of the PV and can give us wrong impression of severity of MR, so we have to prove it in other side that there is reversing S wave