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And if you have a carradice type bag, that also often blocks the light if your frame isn't large.
THat is why on my Isen I went with the son mudguard mounted option and have been really happy. Wiring is nice and tidy inside fender with gorilla tape, then into frame at BB.
On my other bike I solved this like this
The SON seatpost mount light is very nice and does a similar job, but is expensive.
That's the problem with that one linked, it's no good if carrying a saddle bag. And if not carrying a bag you may as well get the seat post version.