I disagree with bowing at the elevations.
In Eucharistic Prayer I, n. 89, it has:
“He bows slightly.
TAKE THIS, ALL OF YOU, AND EAT OF IT,
FOR THIS IS MY BODY,
WHICH WILL BE GIVEN UP FOR YOU.
He shows the consecrated host to the people, places it again on the paten, and genuflects in adoration.”
By having “shows” it means that the faithful should be looking at the consecrated host.
The instruction for concelebrants is in General Instruction of the Roman Missal (GIRM) n. 222 (c):
“the words of the Lord, with each extending his right hand toward the bread and toward the chalice, if this seems appropriate; and at the elevation looking toward them and after this bowing profoundly;”
GIRM 43 has about the faithful: “They should kneel, on the other hand, at the Consecration, except when prevented on occasion by ill health, or for reasons of lack of space, of the large number of people present, or for another reasonable cause. However, those who do not kneel ought to make a profound bow when the Priest genuflects after the Consecration.”
[Excerpts from the English translation of The Roman Missal, © 2010 International Commission on English in the Liturgy Corporation. All rights reserved.]