You need to make the shock mounts with the suspension at ride height for sure.
Measure the total travel of the shock and make the mount so there is about 2/3 of the total travel available for compression (bump) travel and 1/3 for extension (droop). I build the mounts as short as possible to reduce the leverage on the bracket, but not so short that you can't move the upper control arm for alignment. That will determine the shock angle. In the last C4 suspension I put in I built mounts that come over the top of the control arm so A-arm clearance wasn't an issue. That was a bit more involved than coming up from under the upper control arm on the outside face, but for this application I was using long coil-overs to gain travel, so it was necessary.