I did this inside with brick and went through the same research.
In the end, I just paid a good A/V company about $250 to mount it as they had a great hammer drill, robust anchors, 2 guys and the know-how.
I did not want that thing to come crashing down (55" Samsung Frame, and it wasn't cheap). They did a great job and knocked it out in an hour; mounted to the brick, not the mortar.
One downside of drilling into the brick is that you can't easily repair it later, while mortar is pretty easy to fix.
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