Yes, the sill plates are flat at the bottom.
I have the illuminated ones on my '17. Expensive, but looks great.
After 5 yrs, the batteries (button batteries) continue to work well.
My daughter in college has that car now. Cannot take a picture to post it here.
I'd love to have them on my recently acquired '22 CX5.
I emailed Mazdaparts.org. They admitted that, what they are selling does not fit 2022.
It seems like it does not fit 2018-2021 well either....
That gaps are going to collect dirts over time.