This may or may not be helpful, but fboab and I currently use this kind of setup:
We have 2x 32" tvs mounted on stands; she uses an Apple TV, I use an old work PC. We generally use Zwift these days, but this setup is wholly TrainerRoad compatible if that's how you want to roll.
32" TVs are cheap as chips now - I'm not sure why you'd want to use HD or a monitor. When we're doing 4+W/Kg in a sprint, screen res is pretty much the last thing on your mind.
ETA: A soundbar. Yes. We have one in the living room, which is great for Game of Thrones. Some full-on Soundbar Disco would be great for a workout I guess, but the TV sound isn't that bad, and we often connect to Discord for Zwift group/team events.