The Book of Blessings gives a range of options for blessing rosaries, medals, small crucfixes, statues or pictures that will be displayed elsewhere than a church.
The priest or deacon can have a big ceremony, or “1445 When a single religious article is to be blessed, the minister may use the shorter rite provided at the end of this chapter, nos. 1458-1461, or in special circumstances, the short formularly given in no. 1462.”
Does the priest or deacon want to do several blessings of single items? If so, the words given in 1462 are: “May this (name of article) and the one who uses it be blessed, in the name of the Father, and of the Son, + and of the Holy Spirit.” The response is “Amen”. (Book of Blessings, Liturgical Press, Minnesota, 1989, ISBN 0-8146-1875-8, page 549.)
I would have thought the bigger ceremony, of the several articles, would be more appropriate. This requires some planning, and the priest will need to have the Book of Blessings.