Electric box in concrete block wall

[garrett1812]

I am building a BBQ out of stacked concrete blocks. I want to add some electrical outlets into the wall, flush with the wall, not mounted on to the outside. Making the cuts to accommodate the box is not a problem, but how do I attach the box? I am using a landscaping adhesive to hold the block together, so should I glue in the electric box the same? Any good tricks since the box is slightly tapered, but will be sitting on a flat block? Would a metal or plastic box hold up better?

Thanks!



Wall looks like this:
https://www.menards.com/main/p-2382788.htm

Outlet like this (I will actually use a slightly thinner cover plate):
http://www.rooney.com/kitchen4.jpg

 

[marklc]

Glue or cement works well and use a masonry box with underground feeder wire.

 

[garrett1812]

I looked at the masonry boxes, but I don't think any of them are waterproof? This will not have the best protection from water above.