Gaps near max. Fine Art Watercolor is the usual media for canvas in that category.
It's not a very sharp printing canvas, so it's probably better to err on the wide side for the gaps, there's no real penalty in reduced sharpness.
If you can find a profile and settings for Sunset Select Matte Canvas, use those. BC "800M" canvas settings and profiles should also work. Lyve would be OK too.
It's a nice canvas. I ran 8300 profiles from coated targets and the gamut is as good as any matte canvas I've seen.