And remember the distance from the runway to the holding point can change with the class of approach operations.
So 90m may be OK in CAT l conditions but this increases to 137m for CAT ll/lll.
At bigger airports I've always advised crews to use the alternating green and amber taxiway centreline lights as a guide because they denote the Localiser Sensitive Area.
Anticipated separation based on the route and velocity of the subject a/c is all very well providing all participants understand, agree and make appropriate calls within the scope of the operation.
The cross runway anticipated departure clearance at La Guardia is a good example.
SGC