I prefer to look at ” interesting ” things on the walls rather than a pair of newly purchased matching items. Thrift stores, flea markets, art shows, etc . are great sources.

I would hang the TV on the wall #1. After that it becomes an issue of trying to distract that you have a huge TV being the boss of the room or just letting it be. The gallery walls help the TV recede but is visually over whelming. I've debated adding interest with paint. One color two different sheens applied in a pattern of some sort. Wall paper is having a moment. Maybe that would be enough... I've never been one to shop to fill a hole. I find things I love then find a place for them to live in my home. I love your chapel window frames perhaps with a mirrored backing they would feel more complete?

I appreciate the suggestions, thank you!