Could you elaborate a little on how the power supply and various cables connecting the TV to cable box, Roku, DVD player, etc. were handled?

Some fireplaces are deserving of being called a monstrosity. Our old one certainly was. Bellsmom on the kitchen forum enhanced the monster so you can see it better: I begrudged it taking nearly 4' of depth for most of the width of the room to support its tiny firebox. We considered putting the TV over the fireplace in the remodel, but we wanted wood burning and the low emissions fireplaces are all quite tall. Also, I didn't feel it would be comfortable for me that high and the hood might block some of the viewing area from the kitchen. Post remodel we have a tamed fireplace, definitely not a monstrosity: The new fireplace takes just a small bit at one side of the wall leaving the center to our - horror of horrors! - 60" flat screen TV. We like the size because it makes it easier to read the screen when using it as an internet browser. The large size is also very nice when viewing from the kitchen which is over 20' from the screen: The new fireplace is an EPA Phase II wood burning fireplace. It runs efficiently and produces minimal particulates. Convection air flow around the firebox heats the room nicely and the intake air control allows control of how quickly the fuel burns. We live in an area with cool winters - enough that the additional warmth in the evening is nice since we usually keep our thermostats low. It heats the family room and kitchen nicely and the room is still comfy in the morning. Because it is EPA phase II, it's legal to use on most "No Burn" days. So far we haven't had to buy wood. Our yard and tree trimmers of neighbor's trees have supplied enough.

As far as I can see, there is nothing wrong w/ existing fireplace. If you are going to put tv over fireplace, I recommend this mount. There is a motorized version, also. https://www.dynamicmounting.com/product/down-and-out-manual-mount/

The most important thing to think about at this stage is where you want the visual focus of the room. If there is nothing else as the focal point, and you do not plan to install a TV, then making this stand out as a prominent feature (with mantel and paint or wallpaper for texture or adding a great piece of wall art) is great. Just keep in mind that electrical code may require that the outlet maintain a cover plate for safety. Please make sure whoever does this work for you knows the local codes and keeps your home safe; you can always "hide" the plate with accessories, which we have done on many jobs.