Wall cabinets, IKEA suspension

I need to fit around 4 ikea method wall cabinets on a suspension rail. I cannot find any suggestions on what size screws to use on a brick wall with the suspension. My house is old and terraced and sometimes when you drill to a wall, the bricks don't seem to be sturdy and strong, and joints between bricks are almost just dust.

I'm thinking of using coach screws , plugs 10X50mm and screws 6X60mm. Instructions says suitable for TVs and radiators so hopefully will hold the wall units too....

Wall cabinets, IKEA suspension