I would definitely be suggestive! Last summer my home sale fell through just before closing because of a job loss. Unfortunately, we had already moved everything out. In the two months it was empty we got a lot of negative comments about the floor plan and layout of the house. We put a table with 4 chairs in the dining room, placemats on the table, a sofa and chair in the living room, an accent table in the foyer, a chair by the fireplace in the family room, a table and 4 chairs in the breakfast nook, 2 stools by the kitchen peninsula with full place settings on the counter, one picture on the mantle, towels in the bathrooms, pillow shams and throw pillows to suggest bed placement in the bedrooms, a simple desk and chair in an extra room to suggest an office, and a tv stand to suggest TV placement in the rec room basement. In our case some of the smaller areas looked a lot bigger with a little furniture in them. Having something in each room gave it just a little more warmth, and I think it's hard for some people to make an emotional connection to an empty house. Some of the furniture we took out of our new house, some we borrowed, and some we bought at Ikea. After we did the staging we got a lot of "shows really well" comments and no more negative floor plan comments. We talked to one staging company, and they were planning to do only the living room, dining room, breakfast nook, and master bedroom.

You may not "need" a cabinet that was made to be sold as a tv stand. A floating shelf or a box shelf or a sofa table or a credenza or a bookcase or dresser or the orphaned top of a hutch from a china cabinet or, if you want quirky, even a fireplace surround and mantel (even without the fireplace) could work just as well for the purpose of having as a place to set tv/media related items beneath the tv; however, as you make your decision, do consider what wires you want/need to hide. If you appreciate symmetry, you will want whatever you do finally choose to be at least as wide as the tv. so if you're considering either 67" or 70" tv, if you choose an item that is at least 70" wide, you will not be disappointed with the width. If you prefer to hang your tv on the wall above a shelf, but you don't want the wires to show, you could use hollow porch post pieces to cover the cable and electrical wire creating a pair of faux "legs" for your shelf.

We need pictures and a lot more info as to sizes etc.

The cabinet below the TV in this view came from Costco. The 55" TV is mounted on the cabinet, but could be mounted on the wall behind it. I added the casters.