I bought my genuine Honda mats on Ebay for about half the dealer price. Sealed packet with Honda part number) They came with two floor clips, but on my car at least , there were two floor clips already fitted on the drivers side. I dont know if these were factory fitted, or by the dealer who may have removed mats they had already fitted when I didnt order them.
I didnt bother trying to fit the 'spare' clips on the passenger side, where mats are less likely to slip, and not a safety issue. So I now have two spare clips. (I think Ebay also had the clips available separately ,with their own Honda part number . IIRC about £11 a pair -just for clips
)
I can see that a new installation of floor clips might need some guidance but the rest was just common sense.