Above Glide Slope
In today's world, ATC for whatever reason will from time to time keep you high till you find yourself above the GS. The Airbus FCOM directs the pilot to wind the alt alert above the aircraft altitude, (to prevent a level-off at ALT*), select 1500 fpm down, arm the ILS button and capture the slope. This works well if your ground speed is 140 kts.
Since the groundspeed and rate of descent are linked and affects each other, a good method to determine the rate down is to note the ground speed then add a one to the first two digits. e.g. GS 150, ROD 1600 FPM. GS 160, ROD 1700 FPM. GS 170, ROD 1800 fpm, NOT to exceed 2,000 fpm. The above table represents a 6 degree slope (a 3 degree angle to capture a 3 degree GS). It works very well indeed and takes the terror out of the exercise. Try it, you'll like it.
p.s. When capturing from above with the alt alert above the aircraft altitude, make darn sure the ILS / GS button is active (on), if not you'll fly through the GS. If you check the front of the Jepp approach manual you'll find the table of GS/angles/rate of descent. Research is king.