3.3.5 Looking for Addon that tells distance and behind target for melees

Hi I don't know if this exist. But I have 2 problems playing as melee DPS and am looking for addons to help.

1) I don't always know if I am in dps range of my target. I don't know how big their hitboxes are, and if I want to stay in max range of a target (like Halion). I end up either being too close or I am too far away and lose dps.

2) I can't see if I am behind the boss. For bigger bosses like Marrowgar, Rotface, Anub, or dragons I can see fine.
But for smaller bosses like BPC, Faction Champions, PP oozes, TOC Valkyries just looks like two blobs of black and white , with so many things going on I can't even see myself in the crowded area.

Thanks

The addon you're looking for is called RangeDisplay. However afaik there isn't an addon for telling whether you're in front or behind a target. Cheers.