Rule of thumb what should AGL be at the edge of class bravo airspace

Forget about the triangle or cone. What you want to know is the distance and glide slope angle/deg.

https://community.infiniteflight.com/t/how-to-read-the-hud-screen-heads-up-display/31087?u=brandon_sandstrom

Learn to use your HUD. Learn the ins and outs of the ILS. Then learn how to judge the decent via distance & slope.

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