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Those fuse blocks sd posted, can be mounted directly on the battery with size 00 lag bolts, right into the side of the case and through the plates.
But Scotch exterior-grade double-sided tape, or hot melt glue, or a good adhesive caulk, or the self-adhesive industrial strength velcro, will all make reasonable alternatives. Or you can mount them to a small plate, make a 3/4" hole in it, and let the battery terminal itself stick up through the hole to "anchor" the plate. All sorts of ways.
SD, unless that breaker is one of the special ones that can carry a 5000A surge without fusing shut--it isn't for battery primary service. The conventional breakers all arc shut (useless) with loads around 3500A, and a good battery can put that out into a dead short. The good breakers are damn closed to $100 each.