BMC2U
+1y
For me, some angles are easier than others.
I usually dupe the vehicle only, then flip vertical, then use rotate followed by distort to set the vertical side reflection. For the front and rear I copy either one and fit them to meet the necessary angle then erase some areas to blend them into the side shot. Sometimes I have to use the warp function to nudge and connect the bumper to the side. Then adjust the opacity followed by a layer mask to taper the opacity gradient from the bottom up to the vehicle.