Have to say, 100” width with entry glass slider on one side is going to be limiting. The widest ventless (no gas) I would do is 72” and it would need 7-10” depth (depending on model fireplace chosen. So, then you have to build out framing etc etc. there are models that mount on wall but your outlet has to be properly located to operate the fireplace. All the linear options are modern and your furniture and home is more traditional. Make sure you really understand this before you take it on.
Q
Tv over recessed fireplace.
Q