Configure the following:

1. Playing a game where you have Zeus rights and debug console rights.
2. There is a friendly unit called "myman".
3. Your character is looking at a building with building positions. A good test is "Land_Airport_Tower_F".

Issue the following command block in the debug console

{
private _waypoint = group myman addWaypoint [_x, 0];
_waypoint waypointAttachObject cursorobject;
_waypoint setWaypointHousePosition _forEachIndex;
} forEach (cursorobject buildingPos -1);

Switch to Zeus and inspect myman's waypoints. They will all be coincident at what I assume is the model origin of the building.

The position supplied to addWaypoint doesn't have any influence on the placement of the waypoints.

Specifying the building by id or object doesn't have any influence.

Swapping the order of waypointAttachObject and setWaypointHousePosition doesn't have any influence.