We are trying to locate a fireplace that could be placed in front of a lift TV. The idea is similar to those electric fireplaces with a built-in TV lift, but I want a more efficient unit with NG.

The box housing the Lift mechanism and TV is about 10 "deep and 36" wide.

Because I want to run the venting either on the side or preferably the bottom, I can't find any units that have that option other than a Mantis. The Mantis is pricey and reading on a couple of threads here, they are not that reliable either.

Are there any other fireplaces that have optional vent location?