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Wood is the best attic stairs.
Find a bracket that will span the columns. Drill and insertlead anchors into the brick at the correct locations for the connecting fasteners.
I would build a stud wall and get rid of the recessed niche. Once done you will have plenty of support in securing the TV mount.
Ask for current copies of all their sales and contractors licenses as well as current copies of their general liability and workers comp insurance policies. Also, google them to see if they even "show up" and if they do read their reviews!
Thank you for these points. They are very useful for me as I will be hiring HVAC company near NJ for HVAC repair. I will make sure to ask these questions to them.