You'd have to be talking about an absolutely massive TV. Like, larger than commercially available (to the general public). Which is, of course, possible, but in general, the people who can afford those TVs have someone else paid to figure out how to get it inside and installed. Also, video-walls are a thing that exist, and they absolutely do come apart in sections. What's the difference, you ask? A TV is a single unit display. A video-wall is a (nearly) seemless series of displays that interconnect to form one gigantic display. And they're modular! (And AFAIK extremely hard to find these days, but were moderately popular 10-20 years ago)