My 3 color mixing printer has used optical endstops since it creation in 2016. I print flags for them to mount to the extruder and to the heated bed and adjust where home position is by the length and size of flag I print. It is incredibly reliable and I have never had a moments trouble with this setup even with the cheapest optical sensors I could find. Because it is optical, it is touchless, or rather it never takes wear so in theory it will stay in the exact condition it was in when you installed it always and forever. Here is my X endstop setup. You can clearly see when the extruder homes the flag will enter the optical endstop on the X motor housing.. I didn't see a flag anywhere in any of your pictures.