The double-decker add-a-fuse doesn’t fit in those MX5 Parts diagram numbers 26 (Engine) or 27 (Wiper) fuse slots because 35 (IGN KEY1) fuse is too tall. I had to use a different less satisfactory solution.
(I have a Mazda diagram for NC1 which numbers those fuses as 19 (Engine) or 20 (Wiper), and 10 (IGN KEY1) is too tall)
See my pics about 3/4 of the way down my “How to fit the Vinstar DRL-Fog kit from MX5Parts”, specifically using this lead for the switched Ignition feed to the DRLs