Thank you so much for the quick reply and the link. I wish they have seatstay mount. The rear rack bracket will help, although I wish I could install TWO taillights, hence two brackets, on the rear rack. I think two taillights closely side by side can increase visibility enormously.

Thanks for introducing NiteRider Solas 2w. Will keep watching for any new videos about it

P.S.: One thing about the Radbot 1k that I haven't found its equal is it is also a reflector.