That's not a bad way, but I use a simpler method:
I use spacer blocks to set my slides. All slides mount at the bottom of the drawer sides. I build all my cabinets out of 5/8" melamine, and drawer banks consisting of 3 drawers are usually 6", 12", 12" starting from the top. I use drawer dividers at the front. So, starting with the top drawer, I place a piece of 5/8" melamine on the floor and a spacer on top of that which is then even with the top divider.
The slide gets attached to the wall and is supported by the divider and the spacer. Work both sides. Then another spacer for the middle drawer in the same fashion. The bottom slide goes on the bottom of the case. The actual drawer slide gets attached to the drawer side at the bottom (not on the underside). The slides I use call for a 1" space (1/2" on each side), so my drawers are always 1" 1/6" smaller than the opening. I've never run into issues installing drawers/slides this way.
Some folks call me Vince - other folks call me...........