Is it possible to turn off the rear light during the day but keep the daylight mode on IQ-X
Don't think so.
You can use the Toplight either to two bolts on a rack or, using an adaptor, with one bolt
to the actual rack mount braze ons on the seatstay, like so:
That just never makes sense to me, those are designed to be mounted horizontal and that's when they work best.
The secula comes in a version that can be mounted this way neatly, secuzed also, the tiny one too.
Don't think so.
You can use the Toplight either to two bolts on a rack or, using an adaptor, with one bolt
to the actual rack mount braze ons on the seatstay, like so: