I am planning a complete rewiring of a house that I own,. and I am trying to
figure out how to place the new interior outlets in the existing exterior
walls that are made of stone/masonry. I previously posted about this
property regarding sheetrocking, electrical subpanels, etc. The house will
end up being a rental property.

The property is a 3-story side-by-side "semi-detached" twin home with a full
unfinished basement. I own one side of the twin and someone else owns the
other half next door. All of the lath and plaster has been removed from the
interior walls and ceilings down to the studs and joists. However, all 4 of
the outside walls (front, back, and two sides) are stone. I say "stone",
but it's some kind of red clay-looking blocks that are stacked on top of
each other. Those 4 exterior walls then have a rough coat and a finish coat
of plaster applied right on the stone to create the interior side of each of
those 4 exterior walls of the home -- no lath, just stone and two types of
plaster on top of the stone.

My question is about how to place outlets in those stone/masonry walls. I
don't want to do surface mounted outlets and wiring if I can avoid that. I
can easily notch out the openings for the outlets, and notch out a path up
from the floor to each outlet to get the wire to the outlet. The wiring
will come in from underneath via the now-open ceilings from the floor below.

But, how do I actually mount the electrical boxes in place? Would I just
place the boxes, run the wires to them, and then just mortar the boxes in
place? If so, is there any particular type of box that would be good to
use -- metal, plastic, old work, new work, etc? I will be getting a permit,
and this will end up being inspected before the walls are closed up, so
whatever work I have done will need to meet the applicable code
requirements.

Or, is there another way that electrical outlets are typically wired,
mounted, and secured within masonry/stone walls of a home?