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No, there shouldn't be any issue of inserting between two statements. However, if you only sequence by 1, you'll not be able to insert anything between your newly inserted ACEs, unless you renumber the whole ACL (which might be a good idea). Whether the "location" is ok depends on your overall ACL and its purpose. I.e. whether you have any overlaps in matching (I'm guessing not, as your destination is a single host).
Of course, unless you have a platform that supports ACLs in hardware, or something like 7200's turbo ACL feature, there's a performance benefit to matching the most common matches first (again insuring such sequencing doesn't change your overall ACL match logic). For example, I would also guess your most common port match might be to port 80.
