Hi Ronnie.
I went for No.3 on a 2lt sump, flat from front to back. On the 1.8 sump i would do the same and fill in the hump near the gearbox, drill a few holes in the front / top and it will increase the volume of oil. Alloy sump should cool the oil better.
Using the cvh sump there are 2 holes to drill near the crank at each end.