At every aircarrier that I have worked for, autolands have been requested in order to maintain AIRCRAFT certification as well as pilot currency. In nearly every case, no special request was made to ATC and could be done with a CAT I ILS so long as the approach plate indicated a GS TCH of at least 42 feet and contained no limitation as to the use of the GS below a certain altitude.
These were done in the Lockheed TriStar which is very tolerant of minor localizer irregularities. Common sense must be applied, of course.
Other types may require more care.