how to vertical align snap automation?

since afaik there is no vertical align and the only trick i know to have the same value on 2 points is to copy paste the values in the input box, or using a key modifier (which i don’t remember) that sets all selected points to the same value (can any one remember?).

i would like to have like guide references to snap (like neighbour events) like in Design tools in order to visually and with the mouse be more ocurate. Since it’s not a perfect world Can anyone gimme some tips how to deal with this more quickly?

The modifier by default is ctrl/cmd.