Most HVAC designers work from the equipment forward. Revit points the angle side of the beveled tap in the direction the main duct is drawn. Which means the tap is always backwards. I have resolved this annoyance by creating a beveled tap (attached) that points the angle of the bevel in the opposite direction in which the main duct is drawn. I achieved this by opening the Rectangular Tap - Beveled.rfa, saving as Rectangular Tap - Beveled - Mirrored.rfa. Then while in the Ref. Level view I mirrored (see Tap image 1) everything and deleted (see Tap image 2) the original geometry.