Don't use them below 200 ft.
I agree fully and that's the way I have been trained.
Some airports have double systems one for the wide body/high cockpit and one for the narrow body.
I am not sure about the correctenes of a technique of just following the Glide Slope once below 200 ft.
It will depend if the G/S is Cat III quality at that moment you use it, because it can have serious bends.
My preferance is to use Flight Path vector and V/S below 200 ft to cross-check what I FEEL and SEE.
Once visual inbound the threshold it's all visual.