I use a Whelen TIR3 mounted in place of the reflector just below the tail light, plenty bight.
Those look interesting and the price point is attractive.
Did you consider the LIN version? There is a disclaimer that they are not to be used as brake lights??? Does the same apply to the TIR? It seems the advantage of the LIN is better lateral viz, but are they an older model? You can find all sorts of contradictory info on the LIN vs the TIR re brightness and generation.
Do they play well with the canbus system?
It looks like either the LIN or the TIR could be mounted between the luggage rack and the OEM tail light...did you consider alt locations, though where you have it prob works well?
With anything up to 25 patterns, is there one that flashes for a couple of seconds then goes solid?
Sorry for the deluge of questions, but the Whelen website leaves much to be desired, not even pdfs for install.
TIA