You might need the 1mm spacer which typically goes between 10-speed cassettes with rebated spiders and 8/9/10-speed freehubs. The 1.85mm spacers just gets your 11-speed road freehub down to the width of an 8/9/10-speed one.
Yes, because the cassette is designed to go on a 8/9/10-speed width freehub despite being 11-speed. That's how 11-speed MTB works; same old freehub width, massive inboard overhang.
You might need the 1mm spacer which typically goes between 10-speed cassettes with rebated spiders and 8/9/10-speed freehubs. The 1.85mm spacers just gets your 11-speed road freehub down to the width of an 8/9/10-speed one.