There are all kinds of methods folks use to accurately place a window/door initially including taking advantage of the 'minimal space' hotspots for offsets from existing geometry.
Personally, I find it faster and more visual to place the W/D near where I want it, undo/redo to select it, and then drag a desired hotspot to the final location... or to a temporary location (face of interior wall) and then drag back the desired offset using the Tracker to enter that offset.
"Desired hotspot" will differ depending on if you've set up your casing/trim/etc fully initially. Maybe it is the RO that you want positioned at a precise place. Maybe it is the inside face of jamb to align with a window above. Maybe it is the outside of trim, to align with a wall. There's not a magic one-size fits all solution in my limited experience.
Of course, if I'm aligning with a known element (vs offsetting from other geometry), it's easy, using either the W/D tool's center or edge insertion method.
Dozens of ways of doing it.
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