I had this exact same issue with TRP brakes, I couldnt find a bracket that would sit nicely with the caliper. I ended up mounting my E3 Pro 2 down by the dropout on the mudguard mount, it works really well in fact. I used the Supernova mount and unscrewed the two halves, putting one half on the inside of the light.
Not with the Trp brakes due to the bracing on the arm being in the way. I’ve tried a bunch on different mounts I had including the supernova one to no avail. Either a bar mount or side of fork mount like mine would be your easiest options
I had this exact same issue with TRP brakes, I couldnt find a bracket that would sit nicely with the caliper. I ended up mounting my E3 Pro 2 down by the dropout on the mudguard mount, it works really well in fact. I used the Supernova mount and unscrewed the two halves, putting one half on the inside of the light.