There are more options out there. Just keep looking.
With this piece, you can measure and drill the holes yourself - right into the plastic bumper or the plastic upper trim piece. Or if you are thinking outside the box, cut off the mounting tabs and affix with epoxy. There is even special epoxy for "plastic to plastic".
https://smile.amazon.com/dp/B074W9RV82/ref=gbps_tit_s-5_aa19_9e865817?pf_rd_p=e1da54c7-110f-4046-97da-aa11c13eaa19&pf_rd_s=slot-5&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=EW9E6VXQ0CZ6BBAWX46Z
3D Optic Red LED Rear Bumper Reflector Turn Signal Brake Tail Lights Lamps For 2014 2015 2016 Ford Fusion Mondeo