false glides...
I have only seen them briefly when overflying the airport, in a very slow old turbo prop...
I have never been too worried about false glides, my descent planning take me right to the point where i intercept the correct G/S.
Also I would expect of most of my fellow pilots that before arming the autopilot/ FD system, they pause for one second and think are the parameters looking good... and then monitor the descent rate following the G/S.
Where I fly most G/S are normally only certified to 10 NM, which makes the math very simple... for your standard 3 DEG G/S expect to be just 3000 above the airport...
So yes I have intercepted "many" glides from above, and are "happy" to do...