Gecko, fuses on the power or not ?

Hi all,

I toased a Gecko last night. too late and I got sloppy.

I was wondering what the best way to use fuses would be ?

one on each Gecko ?
one main on the enclosure ?
some other arrangement ?

I had a single fuse on the enclosure on the AC lines. IT was way too
large and didn't blow.

Also, what type of fuses does one use on CNC stuff in general ? fast
ro slo blow ? something different ?

Dave